I've tested the 32bit version, seems to be in very good health, the only problem i've found is: -When you select Multi-Threaded Rendering at misc tab, the emulator crashes. And I remark a pair of things i don't know are specific issues of the 64bit 171, that don't happens in 172v32 and seems to be solved: -When you activate hlsl, the emulator crashes (I've just put the hlsl folder from mame in mess, as long it should work) -Once you launch a game with the option Play and Record avi output, after this, no matter what you do, when you launch a system, an avi output is generated again and again Good job Robert