I created a VM and tested EtreCheck downloaded from the vendor site referenced above. It was clean so at the end of this post I'll include the report. I missed the notification. First time in years I got caught like that. Thanks everyone for their comments.
OK back to the problem at hand. This morning when I checked problem had resurfaced - I did not restart or anything. I went through the OnyX Maintenance and Clean items one check box at a time and after each execution I fast switched to the other user to see if the problem had disapeared. It did not. At the end I restarted and the problem was gone. Looks like I'll have to repeat the process, quit OnyX and restart between each check box. That will take a bit of time. I'll begin as soon as the problem resurfaces.
Some other things I noticed. I can advoid the problem when I logon the first user, return to the list of users logon screen and logon the second user. However, as soon as I switch users the problem resurfaces. It does so regardless of whether I use fast user switch or if I return to the user login screen and use it to switch. Once a user is logged the behavior suggests fast user switch is used no matter how the switch is initiated.
EtreCheck output follows.
EtreCheck version: 1.9.11 (43) - report generated June 9, 2014 at 5:56:48 PM EDT
Hardware Information:
Mac Pro (Early 2008)
Mac Pro - model: MacPro3,1
1 2.8 GHz Quad-Core Intel Xeon CPU: 4 cores
20 GB RAM
Video Information:
NVIDIA GeForce 8800 GT - VRAM: 512 MB
System Software:
OS X 10.9.3 (13D65) - Uptime: 0 days 5:46:18
Disk Information:
ST3500320AS disk3 : (500.11 GB)
EFI (disk3s1) <not mounted>: 209.7 MB
disk3s2 (disk3s2) <not mounted>: 125.03 GB
Boot OS X (disk3s3) <not mounted>: 134.2 MB
disk3s4 (disk3s4) <not mounted>: 125.03 GB
Boot OS X (disk3s5) <not mounted>: 134.2 MB
disk3s6 (disk3s6) <not mounted>: 125.03 GB
Boot OSX (disk3s7) <not mounted>: 134.2 MB
disk3s8 (disk3s8) <not mounted>: 124.28 GB
Boot OS X (disk3s9) <not mounted>: 134.2 MB
ST3500630AS disk2 : (500.11 GB)
EFI (disk2s1) <not mounted>: 209.7 MB
disk2s2 (disk2s2) <not mounted>: 125.03 GB
Boot OS X (disk2s3) <not mounted>: 134.2 MB
disk2s4 (disk2s4) <not mounted>: 125.03 GB
Boot OS X (disk2s5) <not mounted>: 134.2 MB
disk2s6 (disk2s6) <not mounted>: 125.03 GB
Boot OSX (disk2s7) <not mounted>: 134.2 MB
disk2s8 (disk2s8) <not mounted>: 124.28 GB
Boot OS X (disk2s9) <not mounted>: 134.2 MB
ST2000DM001-1CH164 disk5 : (2 TB)
EFI (disk5s1) <not mounted>: 209.7 MB
disk5s2 (disk5s2) <not mounted>: 2 TB
Boot OS X (disk5s3) <not mounted>: 134.2 MB
ST2000DM001-1CH164 disk4 : (2 TB)
EFI (disk4s1) <not mounted>: 209.7 MB
disk4s2 (disk4s2) <not mounted>: 2 TB
Boot OS X (disk4s3) <not mounted>: 134.2 MB
OWC Mercury Electra 6G SSD disk1 : (120.03 GB)
EFI (disk1s1) <not mounted>: 209.7 MB
Mavericks Sandbox (disk1s2) / [Startup]: 119.17 GB (71.38 GB free)
Recovery HD (disk1s3) <not mounted>: 650 MB
OWC Mercury Electra 6G SSD disk0 : (120.03 GB)
EFI (disk0s1) <not mounted>: 209.7 MB
ApertureSSD (disk0s2) /Volumes/ApertureSSD: 119.69 GB (94.09 GB free)
USB Information:
Apple, Inc. Keyboard Hub
Logitech USB Optical Mouse
Apple, Inc Apple Keyboard
Apple Computer, Inc. Apple Cinema HD Display
Apple Inc. Bluetooth USB Host Controller
FireWire Information:
Drobo Drobo3 800mbit - 800mbit max
EFI (disk12s1) <not mounted>: 209.7 MB
DroboS_TM (disk12s2) /Volumes/DroboS_TM: 3 TB (111.34 GB free)
DroboS_xtra (disk12s3) /Volumes/DroboS_xtra: 1.4 TB (1.4 TB free)
Gatekeeper:
Mac App Store and identified developers
Kernel Extensions:
[kext loaded] com.Logitech.Control Center.HID Driver (3.6.0 - SDK 10.6) Support
[not loaded] com.Logitech.Unifying.HID Driver (1.2.0) Support
[kext loaded] com.SiliconImage.driver.Si3132 (1.2.5) Support
[kext loaded] com.TrustedData.driver.VendorSpecificType00 (1.7.0 - SDK 10.7) Support
[kext loaded] com.attotech.driver.ATTOiSCSI (3.4.1b1 - SDK 10.6) Support
[not loaded] com.drobo.SCSI.ThunderBolt (1.1 [66012] - SDK 10.8) Support
[not loaded] com.roxio.TDIXController (1.6) Support
[kext loaded] com.symantec.kext.SymAPComm (11.2.2f3) Support
[not loaded] com.symantec.kext.confidentialData (1.4f5) Support
[not loaded] com.symantec.kext.filesecurity (1.4.3f19) Support
[kext loaded] com.symantec.kext.fw (1.0.3f5) Support
[kext loaded] com.symantec.kext.internetSecurity (1.3.2f5) Support
[kext loaded] com.symantec.kext.ips (1.3.1f7) Support
[kext loaded] com.symantec.kext.pf (4.2.1f7) Support
[not loaded] com.wacom.kext.wacomtablet (6.2.0w4) Support
Startup Items:
Executor: Path: /Library/StartupItems/Executor
ProTec6b: Path: /Library/StartupItems/ProTec6b
SiCoreService: Path: /Library/StartupItems/SiCoreService
Launch Daemons:
[loaded] com.adobe.fpsaud.plist Support
[loaded] com.adobe.SwitchBoard.plist Support
[running] com.attotech.iscsid.plist Support
[loaded] com.barebones.authd.plist Support
[running] com.datarobotics.ddservice64d.plist Support
[not loaded] com.freemacsoft.appcleanerdaemon.plist Support
[loaded] com.prosofteng.DriveGenius.locum.plist Support
[loaded] com.symantec.avscandaemon.plist Support
[running] com.symantec.deepsight-extractor.plist Support
[running] com.symantec.diskMountNotify.plist Support
[failed] com.symantec.MissedTasks.plist Support
[loaded] com.symantec.navapd.plist Support
[running] com.symantec.navapdaemonsl.plist Support
[loaded] com.symantec.Sched501-1.plist Support
[loaded] com.symantec.Sched501-2.plist Support
[running] com.symantec.sharedsettings.plist Support
[running] com.symantec.symdaemon.plist Support
[failed] com.symantec.symSchedDaemon.plist Support
[loaded] com.timesoftware.timemachineeditor.backup-auto.plist Support
[loaded] com.timesoftware.timemachineeditor.helper.plist Support
Launch Agents:
[not loaded] com.adobe.AAM.Updater-1.0.plist Support
[failed] com.canon.MFManager.plist Support
[running] com.Logitech.Control Center.Daemon.plist Support
[running] com.rosettastone.rosettastonedaemon.plist Support
[running] com.symantec.uiagent.application.plist Support
[running] com.wacom.wacomtablet.plist Support
User Launch Agents:
[loaded] com.adobe.AAM.Updater-1.0.plist Support
[failed] com.adobe.ARM.[...].plist Support
[failed] com.adobe.ARM.[...].plist Support
[running] com.prosofteng.DGMonitor.plist Support
User Login Items:
Garmin Express Service
DDAssist
EEventManager
SymSecondaryLaunch
Internet Plug-ins:
JavaAppletPlugin: Version: 14.9.0 - SDK 10.7 Check version
FlashPlayer-10.6: Version: 13.0.0.206 - SDK 10.6 Support
Default Browser: Version: 537 - SDK 10.9
Flash Player: Version: 13.0.0.206 - SDK 10.6 Outdated! Update
AdobePDFViewer: Version: 10.1.2 Support
QuickTime Plugin: Version: 7.7.3
WacomNetscape: Version: 1.1.1-1 Support
GarminGpsControl: Version: 4.0.3.0 Release - SDK 10.6 Support
Silverlight: Version: 5.0.61118.0 - SDK 10.6 Support
WacomTabletPlugin: Version: WacomTabletPlugin 2.0.0.4 Support
iPhotoPhotocast: Version: 7.0 - SDK 10.8
Safari Extensions:
AdBlock: Version: 2.6.37
Open in Internet Explorer: Version: 1.0
ClickToFlash: Version: 2.9.4
Ghostery: Version: 5.2.0
JavaScript Blocker: Version: 4.1.12
Audio Plug-ins:
BluetoothAudioPlugIn: Version: 1.0 - SDK 10.9
AirPlay: Version: 2.0 - SDK 10.9
AppleAVBAudio: Version: 203.2 - SDK 10.9
iSightAudio: Version: 7.7.3 - SDK 10.9
iTunes Plug-ins:
Quartz Composer Visualizer: Version: 1.4 - SDK 10.9
3rd Party Preference Panes:
Flash Player Support
Logitech Control Center Support
Norton\nQuickMenu Support
WacomTablet Support
Time Machine:
Skip System Files: NO
Mobile backups: OFF
Auto backup: NO - Auto backup turned off
Volumes being backed up:
Destinations:
DroboS_TM [Local] (Last used)
Total size: 3
Total number of backups: 23
Oldest backup: 2014-04-16 23:26:08 +0000
Last backup: 2014-06-09 20:28:12 +0000
Size of backup disk: Excellent
Backup size 3 > (Disk size 0 B X 3)
Time Machine details may not be accurate.
All volumes being backed up may not be listed.
Top Processes by CPU:
2% WindowServer
2% Activity Monitor
1% prl_vm_app
1% prl_disp_service
1% prl_client_app
Top Processes by Memory:
471 MB NortonAutoProtect
369 MB prl_client_app
369 MB com.apple.IconServicesAgent
348 MB Safari
143 MB com.apple.WebKit.WebContent
Virtual Memory Information:
7.38 GB Free RAM
3.76 GB Active RAM
5.51 GB Inactive RAM
3.34 GB Wired RAM
848 MB Page-ins
0 B Page-outs