On my studiocat setup, dim pro is solid in x64....BUT, it's Rapture x64 that crashes for me. (Rapture x32 is solid.) CW support has no answers for me yet.
What, specifically, are you doing at crash time? Loading the synth? Loading a prog? Recording? etc. Is there a common thing that you are up to that the crash happens during? (Boy, is that a convoluted sentence!) For me, Rapture x64 crashes during playback, and some patches seem more crash-prone than others.