ERUSSELL  I had same problem... took days to identify. After the Intel security patch abut 4 days (@12/20) ago now my dock started disappearing (and then reappearing on its own) on first mouse click. That was the obvious issue but it broke further mouse clicks frequently, couldn't select properly, various unexpected behaviors. Finally deleted Stickie Windows (other apps too but it was the one after which the system worked). Then downloaded and reinstalled thinking maybe SW had been updated. Same problem. Now off system. I like the program have used it for years, but it needs updating now.  
(Version 2.4.1)