Thanks Devin
That was the problem, your solution worked.
( e.g. Window->Preferences->Extensions dialog. Just check or uncheck V-Ray for SketchUp )
'SketchUcation Plugins Manager' is a 'plugin' that helps manage 'extensions' and 'plugins'.
Initially, I enabled V-Ray through the Window->Preferences->Extensions dialog.
Some how, down-the-line, the extension status changed and I didn't realize it.
Appreciate your help,
Sherwood