Start10 asking for new liense

I've been running Start10 for over 10 years (when it was first called Start8).  I have it running on my 2 home computers.  But just the other day, on 1 computer, it tells me that it is not activated because it is already activated elsewhere.  Is this a new restriction?  Pressing the Start button seems to do nothing.  And I can't even figure out out to open Start10 to figure out the status.