Its funny how when I try new things in Creo, I get many crashes... even repeated ones. But once I "slow down" and follow a more systematic approach, it begins to behave. I think of this as the software somehow "tripping over itself" when you get the pale window just prior to a hard crash. I think this still goes back to the old Unix kernel which windooze simply cannot handle.
I haven't upgraded to M070 and am still working on M040. I can still crash it but for the most part it is stable. I'm afraid of getting halted in the middle of a project due to upgrading. I have already seen things fail that worked fine back in M020 (and reported of course!). Have you considered downgrading back to a much earlier version? M020 was pre-windooze 8 and M030 was the first performance slow-down from the windooze 8 implementation. M040 was a minor improvement. I can't speak for M050 - M070 since I just bypassed them for now.