2013 HELP: Troubleshooting: The viewer screwer

Viewer screwer.  Viewer was working, got screwed up.
Troubleshooting
Weird things.  Groups won't open.  Other features won't work ...
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Probably corrupted files
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Indicators:

• The problem appeared after a crash.  
• (A crash can corrupt files)
• -
• You don't see that problem with another computer on the same internet connection.
• (Isolates the problem to the computer).

What to do:
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Clear cache:   This may work, and is worth trying because it is easy.
How:

• Preferences  V3.2 Preferences button (gears)
• Advanced Tab
• Clear Cache
• Click OK to save.
• Log off and log back on.  
• Expect a delay on logging in because the cache will reload. 

If clearing cache does not fix the problem, do a clean install.
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Clean Install:  Completely remove the files left from the previous installation.
For Windows, at least, I recommend that you first do a regular uninstall using the Control Panel (click the Start button to find is).  Then follow the instructions in the link below
How to do a clean install (Firestorm)
These instructions apply to any viewer, with appropriate changes in the names.
After the cleaning, install whatever viewer you want.  

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• Thinkerer Melville/Selby Evans