Thanks, Eric Root. I had already checked with my son in NY: he told me that the Guardian site works for him there in Safari by reverting to the US version of the site.
I should stress that this problem is new — probably since I updated to macOS 10.12.3 — and I have not noticed problems with sites other than the Guardian one.
Anyway, here is the EtreCheck report:
EtreCheck version: 3.1.5 (343)
Report generated 2017-02-06 17:34:50
Download EtreCheck from https://etrecheck.com
Runtime 2:02
Performance: Excellent
Click the [Support] links for help with non-Apple products.
Click the [Details] links for more information about that line.
Click the [Remove] links to remove adware.
Problem: Other problem
Description:
Safari does not open awebsite
Hardware Information:ⓘ
Mac mini (Late 2012)
[Technical Specifications] - [User Guide] - [Warranty & Service]
Mac mini - model: Macmini6,1
1 2.5 GHz Intel Core i5 (i5-3210M) CPU: 2-core
4 GB RAM Upgradeable - [Instructions]
BANK 0/DIMM0
2 GB DDR3 1600 MHz ok
BANK 1/DIMM0
2 GB DDR3 1600 MHz ok
Bluetooth: Good - Handoff/Airdrop2 supported
Wireless: en1: 802.11 a/b/g/n
Video Information:ⓘ
Intel HD Graphics 4000
DELL P1913S 1280 x 1024 @ 60 Hz
System Software:ⓘ
macOS Sierra 10.12.3 (16D32) - Time since boot: about 3 hours
Disk Information:ⓘ
CT480BX200SSD1 disk0 : (480.1 GB) (Solid State - TRIM: No)
[Show SMART report]
EFI (disk0s1) <not mounted> : 210 MB
Macintosh HD (disk0s2) / [Startup]: 479.24 GB (297.55 GB free)
Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
USB Information:ⓘ
Apple, Inc. IR Receiver
Apple Inc. BRCM20702 Hub
Apple Inc. Bluetooth USB Host Controller
Apple, Inc. Keyboard Hub
Mitsumi Electric Apple Optical USB Mouse
Apple, Inc Apple Keyboard
Firewire Information:ⓘ
LaCie d2 DVDRW FW/USB 400mbit - 400mbit max
Thunderbolt Information:ⓘ
Apple Inc. thunderbolt_bus
Gatekeeper:ⓘ
Mac App Store and identified developers
Adware:ⓘ
/Library/LaunchDaemons/com.MacUpdater.agent.plist
~/Library/LaunchAgents/com.sourcesoftwarehub.AppTech.plist
2 adware files found. [Remove]
Kernel Extensions:ⓘ
/Applications/Parallels Desktop.app
[not loaded] com.parallels.kext.hypervisor (12.1.1 41491 - SDK 10.9 - 2016-11-28) [Support]
[not loaded] com.parallels.kext.netbridge (12.1.1 41491 - SDK 10.9 - 2016-11-28) [Support]
[not loaded] com.parallels.kext.usbconnect (12.1.1 41491 - SDK 10.9 - 2016-11-28) [Support]
[not loaded] com.parallels.kext.vnic (12.1.1 41491 - SDK 10.9 - 2016-11-28) [Support]
/Applications/Toast 9 Titanium/Toast Titanium.app
[not loaded] com.roxio.BluRaySupport (1.1.6 - 2017-01-21) [Support]
/Applications/Utilities/DiskWarrior.app
[not loaded] com.alsoft.Preview (4.4 - 2011-09-23) [Support]
/System/Library/Extensions
[not loaded] com.Ondesoft.driver.OndeAudioRecorderDevice (1.0.0 - OS X 10.7 - 2017-01-24) [Support]
[not loaded] com.palm.ClassicNotSeizeDriver (3.2.1 - 2017-01-24) [Support]
~/Library/Services/ToastIt.service/Contents/MacOS
[not loaded] com.roxio.TDIXController (2.0 - 2016-11-23) [Support]
System Launch Agents:ⓘ
[not loaded] 7 Apple tasks
[loaded] 172 Apple tasks
[running] 101 Apple tasks
System Launch Daemons:ⓘ
[not loaded] 38 Apple tasks
[loaded] 172 Apple tasks
[running] 101 Apple tasks
Launch Agents:ⓘ
[loaded] com.acronis.acep.plist (2015-11-13) [Support]
[not loaded] com.adobe.AAM.Updater-1.0.plist (2016-11-10) [Support]
[failed] com.adobe.AdobeCreativeCloud.plist (2016-11-10) [Support] - /Applications/Utilities/Adobe Creative Cloud/ACC/Creative Cloud.app/Contents/MacOS/Creative Cloud: Executable not found!
[running] com.arcsoft.esinter.plist (2013-05-30) [Support]
[running] com.epson.Epson_Low_Ink_Reminder.launcher.plist (2015-12-20) [Support]
[running] com.epson.ecrp.launcher.plist (2014-12-20) [Support]
[loaded] com.epson.esua.launcher.plist (2016-12-30) [Support]
[running] com.epson.eventmanager.agent.plist (2017-01-09) [Support]
[loaded] com.epson.ews.launcher.plist (2014-12-20) [Support]
[failed] com.epson.scannermonitor.plist (2017-01-09) [Support]
[loaded] com.google.keystone.agent.plist (2017-01-14) [Support]
[not loaded] com.oracle.java.Java-Updater.plist [Support]
[loaded] org.macosforge.xquartz.startx.plist (2016-05-05) [Support]
Launch Daemons:ⓘ
[failed] com.MacUpdater.agent.plist (2016-11-15) Adware! [Remove]
[loaded] com.adobe.SwitchBoard.plist (2013-06-14) [Support]
[running] com.adobe.adobeupdatedaemon.plist (2016-11-10) [Support]
[running] com.adobe.agsservice.plist (2017-01-27) [Support]
[loaded] com.adobe.fpsaud.plist (2016-12-16) [Support]
[running] com.arcsoft.eservutil.plist (2013-05-30) [Support]
[running] com.bombich.ccchelper.plist (2016-10-01) [Support]
[loaded] com.google.keystone.daemon.plist (2017-01-24) [Support]
[failed] com.informer.mac.daemon.plist (2013-07-01) [Support] - /usr/libexec/MIDaemon: Executable not found!
[running] com.insynchq.insync.daemon.plist (2017-01-04) [Support]
[loaded] com.macpaw.CleanMyMac2.Agent.plist (2014-12-20) [Support]
[loaded] com.macpaw.CleanMyMac3.Agent.plist (2015-05-19) [Support]
[loaded] com.malwarebytes.HelperTool.plist (2016-11-15) [Support]
[running] com.microsoft.autoupdate.helper.plist (2016-12-15) [Support]
[loaded] com.microsoft.office.licensing.helper.plist (2015-04-23) [Support]
[loaded] com.microsoft.office.licensingV2.helper.plist (2015-08-15) [Support]
[not loaded] com.oracle.java.Helper-Tool.plist [Support]
[loaded] com.oracle.java.JavaUpdateHelper.plist (2014-01-29) [Support]
[loaded] com.ovh.hubiCFinderPlugin.Installer.plist (2016-07-23) [Support]
[loaded] com.rogueamoeba.instanton-agent.plist (2016-07-07) [Support]
[loaded] org.macosforge.xquartz.privileged_startx.plist (2016-05-05) [Support]
[loaded] uk.co.canimaansoftware.ClamXavHelper.plist (2016-09-29) [Support]
[loaded] uk.co.canimaansoftware.ClamXavHelperUpdater.plist (2016-07-12) [Support]
User Launch Agents:ⓘ
[running] com.acronis.monitor.plist (2017-01-26) [Support]
[loaded] com.adobe.AAM.Updater-1.0.plist (2016-11-10) [Support]
[loaded] com.adobe.ARM.[...].plist (2016-10-22) [Support]
[failed] com.amazon.cloud-player.plist (2014-01-02) [Support] - /Applications/Amazon Cloud Player.app/Contents/MacOS/Amazon Music Helper: Executable not found!
[running] com.amazon.music.plist (2015-07-31) [Support]
[loaded] com.apple.AddressBook.ScheduledSync.PHXCardDAVSource.34A166CB-A1A7-4B36-BFB7-D6D E5C5EFD68.plist (2017-01-24)
[loaded] com.apple.AddressBook.ScheduledSync.PHXCardDAVSource.A402F2DD-4D90-4351-8655-61E 1120B00A7.plist (2017-01-24)
[loaded] com.apple.AddressBook.ScheduledSync.PHXCardDAVSource.FC6B64BD-AEAF-40BD-AFE3-680 B308B1E8F.plist (2017-01-24)
[failed] com.macpaw.CleanMyMac3.Scheduler.plist (2016-12-10)
[failed] com.sourcesoftwarehub.AppTech.plist (2016-07-16) Adware! [Remove]
[failed] com.vemedio.Snowtape.RadioAgent.plist (2015-08-19) [Support] - /Applications/Snowtape.app/Contents/MacOS/RadioAgent: Executable not found!
[loaded] uk.co.canimaansoftware.clamxav.UninstallWatcher.plist (2016-12-10)
User Login Items:ⓘ
NeoFinder Global QuickFind Application
(/Applications/NeoFinder.app/Contents/Resources/NeoFinder Global QuickFind.app)
CopyPaste Pro Application
(/Applications/CopyPaste Pro.app)
Flux Application
(/Applications/Flux.app)
Isolator Application
(/Applications/Isolator.app)
Typinator Application
(/Applications/Typinator.app)
WeatherMan Application
(/Applications/WeatherMan.app)
CCC User Agent Application (2016-09-22)
(/Applications/Carbon Copy Cloner.app/Contents/Library/LoginItems/CCC User Agent.app)
Dropbox Application
(/Applications/Dropbox.app)
Insync Application
(/Applications/Insync.app)
Stickies Application
(/Applications/Stickies.app)
PopChar Application
(/Applications/PopChar.app)
Launch Nikon Message Center 2 Application
(/Applications/Nikon Software/Nikon Message Center 2/Nikon Message Center 2.app/Contents/SharedSupport/Launch Nikon Message Center 2.app)
Audio Hijack 3 Schedule Helper Application Hidden
(/Library/Application Support/Audio Hijack/Audio Hijack 3 Schedule Helper.app)
Parallels Toolbox Application
(/Applications/Parallels Toolbox.app)
MoonMenu Application
(/Applications/MoonMenu.app)
Internet Plug-ins:ⓘ
JavaAppletPlugin: 15.0.1 - SDK 10.7 (2016-10-01) Check version
o1dbrowserplugin: 5.41.3.0 - SDK 10.8 (2015-12-11) [Support]
OfficeLiveBrowserPlugin: 12.3.6 (2013-04-24) [Support]
AdobeExManDetect: AdobeExManDetect 1.1.0.0 - SDK 10.7 (2015-09-11) [Support]
Flip4Mac WMV Plugin: 3.3.7.2 - SDK 10.7 (2015-10-30) [Support]
AmazonMP3DownloaderPlugin101750: AmazonMP3DownloaderPlugin 1.0.17 - SDK 10.4 (2013-05-09) [Support]
AdobeAAMDetect: 3.0.0.0 - SDK 10.9 (2016-11-10) [Support]
AdobePDFViewerNPAPI: 11.0.18 - SDK 10.6 (2016-10-22) [Support]
FlashPlayer-10.6: 24.0.0.194 - SDK 10.9 (2017-01-10) [Support]
AmazonMP3DownloaderPlugin101749: AmazonMP3DownloaderPlugin 1.0.17 - SDK 10.4 (2013-04-28) [Support]
QuickTime Plugin: 7.7.3 (2016-12-13)
Flash Player: 24.0.0.194 - SDK 10.9 (2017-01-10) [Support]
googletalkbrowserplugin: 5.41.3.0 - SDK 10.8 (2015-12-11) [Support]
SharePointBrowserPlugin: 14.7.1 - SDK 10.6 (2016-12-15) [Support]
AdobePDFViewer: 11.0.18 - SDK 10.6 (2016-10-22) [Support]
GarminGpsControl: 4.2.0.0 - SDK 10.8 (2014-03-31) [Support]
Silverlight: 5.1.41212.0 - SDK 10.6 (2016-01-17) [Support]
Scorch: Unknown - SDK 10.2 (2014-11-06) [Support]
DirectorShockwave: 12.0.5r146 - SDK 10.6 (2013-10-24) [Support]
User internet Plug-ins:ⓘ
RealPlayer Plugin: Unknown (2013-04-29) [Support]
Picasa: 1.0 - SDK 10.6 (2015-08-26) [Support]
Google Earth Web Plug-in: 7.1 (2016-07-04) [Support]
Safari Extensions:ⓘ
Open in Internet Explorer - Parallels - http://www.parallels.com (2016-11-28)
BestGuess - Alexandru Ionita - http://www.cloud-extensions.com (2016-03-19)
Boomerang for Gmail - Baydin - http://www.boomeranggmail.com (2014-12-17)
InternetAssistant - Cosmina Beteringhe - http://www.sourcesoftwarehub.com (2016-07-16)
iTube Studio - iSkysoft Studio - http://www.iskysoft.com (2016-03-04)
Adblock Plus - Eyeo GmbH - https://adblockplus.org/ (2016-12-21)
3rd Party Preference Panes:ⓘ
Flash Player (2016-12-16) [Support]
Flip4Mac WMV (2015-10-30) [Support]
Paragon NTFS for Mac ® OS X (2015-09-04) [Support]
Time Machine:ⓘ
Skip System Files: NO
Mobile backups: OFF
Auto backup: YES
Volumes being backed up:
Macintosh HD: Disk size: 479.24 GB Disk used: 181.69 GB
Destinations:
Backup [Local]
Total size: 500.10 GB
Total number of backups: 10
Oldest backup: 07/08/2016, 16:22
Last backup: 24/01/2017, 09:25
Size of backup disk: Too small
Backup size 500.10 GB < (Disk used 181.69 GB X 3)
Top Processes by CPU:ⓘ
5% WindowServer
4% kernel_task
1% fontd
1% com.apple.AmbientDisplayAgent
1% mdworker(11)
Top Processes by Memory:ⓘ
659 MB kernel_task
336 MB mdworker(11)
143 MB Finder
111 MB WindowServer
98 MB Dropbox
Virtual Memory Information:ⓘ
1.54 GB Available RAM
593 MB Free RAM
2.46 GB Used RAM
982 MB Cached files
239 MB Swap Used
Diagnostics Information:ⓘ
Feb 6, 2017, 02:23:05 PM /Library/Logs/DiagnosticReports/Insync_2017-02-06-142305_[redacted].cpu_resourc e.diag [Details]
/Applications/Insync.app/Contents/MacOS/Insync
Feb 6, 2017, 02:20:24 PM Self test - passed
Feb 6, 2017, 11:24:51 AM /Library/Logs/DiagnosticReports/Insync_2017-02-06-112451_[redacted].cpu_resourc e.diag [Details]
Feb 4, 2017, 09:22:04 PM /Library/Logs/DiagnosticReports/Insync_2017-02-04-212204_[redacted].cpu_resourc e.diag [Details]
Feb 4, 2017, 06:04:08 PM ~/Library/Logs/DiagnosticReports/PopChar_2017-02-04-180408_[redacted].crash
com.macility.popchar3 - /Applications/PopChar.app/Contents/MacOS/PopChar
Feb 4, 2017, 11:46:16 AM /Library/Logs/DiagnosticReports/Insync_2017-02-04-114616_[redacted].cpu_resourc e.diag [Details]