>>UPDATE. Re-starting VFP and re-running 'Check for Updates' cleared the problem. So, the only annoying problem is that it tries to open CodePlex sites in multiple tabs when I'm not asking for that.
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>What tries to open CodePlex web pages? Thor? GoFish? Check for Updates????
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>Which one?

Invoking Thor with 'Run' opens 2 new tabs in Google Chrome.

I closed them. Then running 'Check for Updates' opened 4 new tabs in GC.

Running GoFish does not open new tabs.