I've been running fences for years, and have never had an issue. But recently (it started the week of Aug 14th, not sure of the exact day) it is prompting for my product key.  When I enter my product key and email address, I get the prompt, "Thank You!  Fences has been successfully activated."

I click the Finish button at the bottom of that dialog, and then I get another pop-up that says, "Fences has not been activated. Please go back to complete activation."  If I click back, it shows the first message again, saying it's been successfully activated.  This is an endless loop.

I can't do anything in Fences, because every time I do, it pops up the prompt asking me to Enter my product key, Purchase a Product Key or Start a 30-day trial.