I've been using Creo 2.0 M070 since its release, and I haven't had one single issue, not even one crash. I use the HPZ800 workstation with Windows 7 Enterprise, Version 6.1.7601 Service Pack 1, Build 7601, 64-bit OS.
I have a compatiable NVIDA Quadro 600 graphics card (PTC tested and recommended) with adaquate memory.
I have 6 GB of physical memory.
Many crashes have occured due to incompatiable graphics cards and hardware and poorly derived config.pro files.