Not sure of this is a bug but up until 1.6 I was using the 32 bit version of MPC Ren within Win 7 Ultimate and my crashes were minimal. Since the arrival of 1.6 the 32 bit version has become prone to crashing from quite simple things like changing samples or just changing a page/mode.
I'll have to use the 64 bit version permanently now but will lose out on quite a few plug ins that haven't made that 64 bit leap yet

Wether this is a bug or not I don't know but up until 1.6 the 32bit version worked fine within Win 7 64bit and that is certainly not thee case now.