Jim,
Just for future reference to your work --
I have yet to figure out just why, but the reason for me with the freezing featherdusters is when I switch to the
Intel HD Graphics 4600 on the laptop. If it is running using that everything works fine on the aquarium EXCEPT for the feather dusters. If I change back to the primary video source being the nVidia 780m, then everything works fine INCLUDING the featherdusters.
I will continue to play with the settings here to see if I can solve the problem, but I can definitely tell this is the cause of the freezing at this point.