It seems on Windows 7 x64 SP1 (Yeah, I know. I bought a bunch of new hardware then folded.) whenever you switch modes while there's playback occurring, the entire system will lockup. Card: Auzentech Forte PIU: PAX_AZT_FORTE71_V1.21_SWPACK_30JUL10V2.00.7z Test Media: http://www.thesixtyone.com/s/vz4Q2xWk3PU/ (Anything works.) EDIT2: THX installation failed, just in case you didn't know if it worked or not.