I'm having similar problems... Any Viewer with Mesh capability- so far, Viewer 3 and Singularity 1.6- crashes regulartly on startup, and then the crash logger crashes. Between one in three and one in four startups of either viewer will BSOD my computer. Seriously, this is ridiculous. These are the only applications behaving like this. Before anyone asks, i checked my graphics and sound driver versions, and yes i run other 3d applications on this system and none of them are randomly BSODing on startup.