With my set up, I've been noticing a lot of draw back after I end a game and return to windows with 3.8 or 3.9 Cat's. The windows graphical user interface on my desk top gets shrouded by a cover of solid color which includes the task bar at the bottom. I've since then retrogressed to the 3.6 Cat's and I've liked their performance better.
It's not really a stability issue, just a little glitch I really don't mind for.