I followed your (and others advice) running Etrecheck, removing some apps, changing a few settings. The symptoms as originally described still exist. I am including a post-Chrome tab crash Etrecheck log, and a log after restart.
Thanks for your opinions ...
Post Google Chrome new tab crash
EtreCheck version: 3.4.4 (448)
Report generated 2017-08-26 13:53:35
Download EtreCheck fromhttp://etrecheck.com
Runtime: 0:55
Performance: Excellent
Click the [Lookup] links for more information from Apple Support Communities.
Click the [Details] links for more information about that line.
Failed to read adware signatures!
Problem:Apps are crashing
Disk Information: ⓘ
Disk information not found!
System Software: ⓘ
Operating system information not found!
Configuration files: ⓘ
/etc/sysctl.conf - File exists but not expected
/etc/hosts - Count: 1
Time Machine: ⓘ
Time Machine information requires OS X 10.8 "Mountain Lion" or later.
Top Processes by CPU: ⓘ
Top Processes by Memory: ⓘ
Virtual Memory Information: ⓘ
0 B Available RAM
0 B Free RAM
0 B Used RAM
0 B Cached files
0 B Swap Used
Files deleted by EtreCheck: ⓘ
2017-08-26 09:52:54 - ~/Library/LaunchAgents/com.citrixonline.GoToMeeting.G2MUpdate.plist - Unknown
2017-08-26 09:52:54 - ~/Library/LaunchAgents/com.nero.HSMMonitor.plist - Unknown
2017-08-26 09:53:04 - /Library/LaunchDaemons/com.tvmobili.tvmobilisvcd.plist – Unknown
Post restart iMac
EtreCheck version: 3.4.4 (448)
Report generated 2017-08-26 14:25:52
Download EtreCheck from https://etrecheck.com
Runtime: 4:46
Performance: Good
Click the [Lookup] links for more information from Apple Support Communities.
Click the [Details] links for more information about that line.
Problem:Apps are crashing
Description:
4 symptoms that now seem to arise together from time to time. Timeline may be connected to the latest security update in July.
i) Google Chrome crashes out on startup by failing to load extensions and showing broken tabs, or new tabs fail.
with
ii) terminal fails to load showing [forkpty: Resource temporarily unavailable] [Could not create a new process and open a pseudo-tty.])
and also
iii) dmg's cannot install, with system declaring "No such file or directory".
iv) About this Mac pane loads empty or populates very slowly.
Symptoms usually disappear with restart, and then return intermittently.
Hardware Information: ⓘ
iMac (27-inch, Mid 2010)
[Technical Specifications] - [User Guide] - [Warranty & Service]
iMac - model: iMac11,3
1 2.8 GHz Intel Core i5 (i5) CPU: 4-core
16 GB RAM Upgradeable - [Instructions]
BANK 0/DIMM0
4 GB DDR3 1333 MHz ok
BANK 1/DIMM0
4 GB DDR3 1333 MHz ok
BANK 0/DIMM1
4 GB DDR3 1333 MHz ok
BANK 1/DIMM1
4 GB DDR3 1333 MHz ok
Handoff/Airdrop2: not supported
Wireless: en1: 802.11 a/b/g/n
Video Information:ⓘ
ATI Radeon HD 5750 - VRAM: 1024 MB
iMac 2560 x 1440
Disk Information:ⓘ
WDC WD1001FALS-40Y6A0 disk0: (1 TB) (Rotational)
[Show SMART report]
(disk0s1) <not mounted> [EFI]: 210 MB
Macintosh HD (disk0s2 - Journaled HFS+) / [Startup]: 956.48 GB (496.72 GB free)
(disk0s3) <not mounted> [Recovery]: 650 MB
BOOTCAMP (disk0s4 - NTFS) <not mounted> : 42.86 GB
HL-DT-STDVDRW GA32N ()
USB Information:ⓘ
EHCI Root Hub Simulation
hub_device
Logitech USB Optical Mouse
Apple Inc. BRCM2046 Hub
Apple Inc. Bluetooth USB Host Controller
Apple Internal Memory Card Reader
EHCI Root Hub Simulation
hub_device
Kyocera Kyocera FS-1300D
Apple Computer, Inc. IR Receiver
Apple Inc. Built-in iSight
System Software:ⓘ
OS X Yosemite 10.10.5 (14F2511) - Time since boot: less than an hour
Configuration files:ⓘ
/etc/sysctl.conf - File exists but not expected
/etc/hosts - Count: 1
Gatekeeper:ⓘ
Mac App Store and identified developers
Kernel Extensions:ⓘ
/Applications/MyToolUtils/TemperatureMonitor.app
[not loaded] com.bresink.driver.BRESINKx86Monitoring (9.0) [Lookup]
/Applications/Toast 11 Titanium/Spin Doctor.app
[loaded] com.hzsystems.terminus.driver (4) [Lookup]
/Applications/Toast 11 Titanium/Toast Titanium.app
[not loaded] com.roxio.BluRaySupport (1.1.6) [Lookup]
/Applications/Tunnelblick.app
[not loaded] net.tunnelblick.tap (20141104 (Tunnelblick build 4790)) [Lookup]
[not loaded] net.tunnelblick.tun (20141104 (Tunnelblick build 4790)) [Lookup]
/Library/Extensions
[loaded] at.obdev.nke.LittleSnitch (3.5.2 - SDK 10.8) [Lookup]
[not loaded] com.BlackBerry.driver.USBCDCNCM (1.0.14 - SDK 10.7) [Lookup]
[loaded] com.malwarebytes.mbam.rtprotection (3.0 - SDK 10.12) [Lookup]
[loaded] com.rim.driver.BlackBerryUSBDriverInt (2.2.16 - SDK 10.7) [Lookup]
[loaded] com.rim.driver.BlackBerryVirtualPrivateNetwork (1.0.18 - SDK 10.8) [Lookup]
/System/Library/Extensions
[not loaded] com.devguru.driver.SamsungComposite (1.2.58 - SDK 10.6) [Lookup]
/System/Library/Extensions/ssuddrv.kext/Contents/PlugIns
[not loaded] com.devguru.driver.SamsungACMControl (1.2.58 - SDK 10.6) [Lookup]
[not loaded] com.devguru.driver.SamsungACMData (1.2.58 - SDK 10.6) [Lookup]
[not loaded] com.devguru.driver.SamsungMTP (1.2.58 - SDK 10.5) [Lookup]
[not loaded] com.devguru.driver.SamsungSerial (1.2.58 - SDK 10.6) [Lookup]
~/Downloads/GeatdyAudioDevice.app
[loaded] com.Greatdy.driver.SystemAudioCapture (1.0.0 - SDK 10.8) [Lookup]
~/Library/Services/ToastIt.service/Contents/MacOS
[not loaded] com.roxio.TDIXController (2.0) [Lookup]
System Launch Agents: ⓘ
[not loaded] 6 Apple tasks
[loaded]148 Apple tasks
[running]58 Apple tasks
System Launch Daemons:ⓘ
[not loaded] 48 Apple tasks
[loaded]136 Apple tasks
[running]79 Apple tasks
Launch Agents:ⓘ
[running]at.obdev.LittleSnitchUIAgent.plist (Objective Development Software GmbH - installed 2015-04-18) [Lookup]
[failed]com.adobe.ARMDCHelper.cc24aef4a1b90ed56a725c38014c95072f92651fb65e1bf9c8e43c37a2 3d420d.plist (Adobe Systems, Inc. - installed 2017-01-11) [Lookup]
[loaded]com.google.keystone.agent.plist (Google, Inc. - installed 2017-07-10) [Lookup]
[running]com.malwarebytes.mbam.frontend.agent.plist (Malwarebytes Corporation - installed 2017-08-26) [Lookup]
[loaded]com.oracle.java.Java-Updater.plist (? 1e5ed1aa 72ac4dde - installed 2017-08-23) [Lookup]
[loaded]com.paragon.updater.plist (Paragon Software GmbH - installed 2015-12-01) [Lookup]
[running]com.rim.BBLaunchAgent.plist (? c583fbf8 ce1b018 - installed 2015-10-08) [Lookup]
[running]com.rim.PeerManager.plist (Research in Motion Limited - installed 2015-05-26) [Lookup]
[running]com.rim.blackberrylink.BlackBerry-Link-Helper-Agent.plist (? 85f34458 ef815663 - installed 2015-10-08) [Lookup]
[not loaded] com.teamviewer.teamviewer.plist (? ? ? - installed 2017-08-23) [Lookup]
[not loaded] com.teamviewer.teamviewer_desktop.plist (TeamViewer GmbH - installed 2017-08-23) [Lookup]
Launch Daemons:ⓘ
[running]at.obdev.littlesnitchd.plist (Objective Development Software GmbH - installed 2015-04-18) [Lookup]
[loaded]com.adobe.ARMDC.Communicator.plist (Adobe Systems, Inc. - installed 2017-01-11) [Lookup]
[loaded]com.adobe.ARMDC.SMJobBlessHelper.plist (Adobe Systems, Inc. - installed 2017-01-11) [Lookup]
[loaded]com.adobe.fpsaud.plist (? 2afb3af7 e92009a9 - installed 2017-07-25) [Lookup]
[loaded]com.cyberghostsrl.CyberghostPrivilegedHelper.plist (Cyberghost SRL - installed 2017-02-27) [Lookup]
[loaded]com.google.keystone.daemon.plist (Google, Inc. - installed 2017-07-26) [Lookup]
[loaded]com.iwaxx.Debookee.PacketTool.plist (Thomas Baudelet - installed 2016-04-15) [Lookup]
[running]com.malwarebytes.mbam.rtprotection.daemon.plist (Malwarebytes Corporation - installed 2017-08-26) [Lookup]
[running]com.malwarebytes.mbam.settings.daemon.plist (Malwarebytes Corporation - installed 2017-08-26) [Lookup]
[loaded]com.microsoft.office.licensing.helper.plist (? 6d8cb30e afb3bef0 - installed 2015-03-11) [Lookup]
[loaded]com.nordvpn.NordVPN.Helper.plist (TEFINKOM & CO S.A - installed 2017-03-04) [Lookup]
[loaded]com.oracle.java.Helper-Tool.plist (Shell Script e3fefdd2 - installed 2017-07-22) [Lookup]
[running]com.rim.BBDaemon.plist (BlackBerry Limited - installed 2015-03-11) [Lookup]
[not loaded] com.rim.nkehelper.plist (Apple, Inc. - installed 2015-05-11)
[running]com.rim.tunmgr.plist (Research in Motion Limited - installed 2015-05-26) [Lookup]
[loaded]com.teamviewer.Helper.plist (TeamViewer GmbH - installed 2017-02-14) [Lookup]
[not loaded] com.teamviewer.teamviewer_service.plist (? ? ? - installed 2017-08-23) [Lookup]
[not loaded] net.privatetunnel.ovpnagent.plist (? 0 ? - installed 2016-06-15) [Lookup]
[loaded]net.tunnelblick.tunnelblick.tunnelblickd.plist (Jonathan Bullard - installed 2017-02-26) [Lookup]
[loaded]org.wireshark.ChmodBPF.plist (Shell Script d4207e05 - installed 2016-01-13) [Lookup]
User Launch Agents:ⓘ
[loaded]com.adobe.ARM.[...].plist (Adobe Systems, Inc. - installed 2015-11-01) [Lookup]
[running]com.akamai.single-user-client.plist (? e313db83 6a3689c4 - installed 2017-01-20) [Lookup]
[loaded]com.cisco.videoguard7.plist (Shell Script c8b7826e - installed 2017-02-09)
[loaded]com.cisco.videoguard7.uninstall.plist (Shell Script 6e9cba9c - installed 2017-07-26)
[running]com.cisco.videoguardmonitor.plist (Shell Script 2864b4de - installed 2017-07-26)
[loaded]com.dropbox.DropboxMacUpdate.agent.plist (Dropbox, Inc. - installed 2017-08-11) [Lookup]
[running]com.proxsign.agent.plist (? 1f40325f cf2f0659 - installed 2017-08-26) [Lookup]
[loaded]com.skype.skype.shareagent.plist (Skype Communications S.a.r.l - installed 2017-08-25) [Lookup]
[loaded]com.spotify.webhelper.plist (? 8431933b 7d8bb87b - installed 2015-12-19) [Lookup]
[loaded]net.tunnelblick.tunnelblick.LaunchAtLogin.plist (Jonathan Bullard - installed 2017-01-30) [Lookup]
User Login Items:ⓘ
GrowlHelperApp Application
(~/Library/PreferencePanes/Growl.prefPane/Contents/Resources/GrowlHelperApp.app )
AdobeResourceSynchronizer Application - Hidden
(/Applications/Adobe Acrobat X Pro/Adobe Acrobat Pro.app/Contents/Support/AdobeResourceSynchronizer.app)
OpenVPN Connect Application
(/Applications/MyToolUtils/OpenVPN/OpenVPN Connect.app)
fuspredownloader Application - Hidden
(~/Library/Application Support/.FUS/fuspredownloader.app)
Internet Plug-ins:ⓘ
AdobePDFViewerNPAPI: 17.012.20095 (installed 2017-08-13) [Lookup]
Flash Player: 26.0.0.131 (installed 2017-06-17) Outdated! Update
AdobePDFViewer: 17.012.20095 (installed 2017-08-13) [Lookup]
googletalkbrowserplugin: 5.41.3.0 (installed 2015-12-11) [Lookup]
Scorch: 6.1.0 (installed 2011-04-07) [Lookup]
ViewRightWebPlayer: 3.3.0.0 (installed 2012-12-19) [Lookup]
iPhotoPhotocast: 7.0 (installed 2012-04-08)
PepperFlashPlayer: 26.0.0.151 (installed 2017-08-26) [Lookup]
RealPlayer Plugin: Unknown (installed 2011-03-08) [Lookup]
DirectorShockwave: 11.5.9r615 (installed 2010-11-09) [Lookup]
QuickTime Plugin: 7.7.3 (installed 2017-08-05)
FlashPlayer-10.6: 26.0.0.131 (installed 2017-06-17) [Lookup]
Musicnotes: 1.18.9 (installed 2011-04-09) [Lookup]
Silverlight: 5.1.50901.0 (installed 2016-11-11) [Lookup]
Default Browser: 600 (installed 2015-08-30)
Flip4Mac WMV Plugin: 3.3.1.3 (installed 2014-08-07) [Lookup]
o1dbrowserplugin: 5.41.3.0 (installed 2015-12-16) [Lookup]
SharePointBrowserPlugin: 14.5.3 (installed 2015-07-30) [Lookup]
proXSignXML: 1.2.21 (installed 2014-06-11) [Lookup]
JavaAppletPlugin: Java 8 Update 144 build 01 (installed 2017-08-23) Check version
User internet Plug-ins: ⓘ
CitrixOnlineWebDeploymentPlugin: 1.0.105 (installed 2013-04-26) [Lookup]
OctoshapeWeb: 1.0 (installed 2017-05-15) [Lookup]
Safari Extensions: ⓘ
Adblock Plus - Eyeo GmbH - https://adblockplus.org/ (installed 2016-12-29)
3rd Party Preference Panes:ⓘ
Akamai NetSession Preferences (installed 2017-01-20) [Lookup]
Flash Player (installed 2017-07-25) [Lookup]
Flip4Mac WMV (installed 2014-05-12) [Lookup]
FUSE for OS X (OSXFUSE) (installed 2015-09-25) [Lookup]
Growl (installed 2010-07-29) [Lookup]
Java (installed 2017-08-23) [Lookup]
MacFUSE (installed 2008-12-19) [Lookup]
Spelling (installed 2011-02-26) [Lookup]
Time Machine:ⓘ
Skip System Files: NO
Mobile backups: OFF
Auto backup: NO - Auto backup turned off
Volumes being backed up:
Macintosh HD: Disk size: 956.48 GB Disk used: 459.77 GB
Destinations:
ImacBak 1TB HD [Local]
Total size: 999.86 GB
Total number of backups: 20
Oldest backup: 04/01/2014 23:20
Last backup: 11/08/2017 16:27
Size of backup disk: Too small
Backup size 999.86 GB < (Disk used 459.77 GB X 3)
Top Processes by CPU:ⓘ
3% WindowServer
3% (nginx)
2% tunmgr
1% PeerManager
1% securityd
Top Processes by Memory:ⓘ
780 MB kernel_task
623 MB mds_stores
133 MB Finder
63 MB coreservicesd
61 MB mdworker
Top Processes by Energy Use:ⓘ
4.72 WindowServer
1.40 mds
1.14 PeerManager
0.62 CiscoVideoGuardMonitor
Virtual Memory Information:ⓘ
13.10 GB Available RAM
11.20 GB Free RAM
2.90 GB Used RAM
1.90 GB Cached files
0 B Swap Used
Software installs:ⓘ
Musicnotes: 1.2 (installed 2017-07-27)
Google Earth: (installed 2017-07-30)
Memory Clean: 6.3 (installed 2017-08-05)
Malwarebytes for Mac: (installed 2017-08-10)
Adobe Acrobat Reader DC (17.012.20093): (installed 2017-08-10)
Adobe Acrobat Reader DC (17.012.20095): (installed 2017-08-13)
Java 8 Update 144: (installed 2017-08-23)
Google Earth: (installed 2017-08-23)
EaseUS CleanGenius: 5.0.0 (installed 2017-08-25)
iBoostUp: 5.9 (installed 2017-08-25)
Microsoft Remote Desktop: 8.0.27319 (installed 2017-08-25)
Duplicate Cleaner For iPhoto: 1.14.2 (installed 2017-08-25)
Adobe Pepper Flash Player: (installed 2017-08-26)
Malwarebytes for Mac: (installed 2017-08-26)
Install information may not be complete.
Diagnostics Information:ⓘ
2017-08-26 14:21:03 tunmgr Crash [Open]
2017-08-26 09:32:30 Google Chrome Canary.app Hang [Open]
2017-08-26 09:32:16 Google Chrome.app Hang [Open]
2017-08-26 08:59:33 EtreCheck.app Crash [Open]
Cause: *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Couldn't posix_spawn: error 35'
terminating with uncaught exception of type NSException
abort() called
2017-08-25 17:06:45 SophosUIServer.app Crash [Open]
Cause: *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Couldn't posix_spawn: error 35'
abort() called
terminating with uncaught exception of type NSException
2017-08-25 11:14:39 storeassetd Crash [Open]
Cause: *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSPlaceholderArray initWithObjects:count:]: attempt to insert nil object from objects[3]'
terminating with uncaught exception of type NSException
abort() called
2017-08-24 12:39:41 Google Drive.app Crash [Open]
Files deleted by EtreCheck:ⓘ
2017-08-26 09:52:54 - ~/Library/LaunchAgents/com.citrixonline.GoToMeeting.G2MUpdate.plist - Unknown
2017-08-26 09:52:54 - ~/Library/LaunchAgents/com.nero.HSMMonitor.plist - Unknown
2017-08-26 09:53:04 - /Library/LaunchDaemons/com.tvmobili.tvmobilisvcd.plist - Unknown