Just for the record, Media Center Mac plays thru 'Built-in Output' on MacMini and MacBookPro fine and seems to play all sample rates that I have up to 192k (with downsampling to 96k at 192k, of course). However, Media Center does not seem to like the RME interface which is a Babyface on USB. Regardless of sample rate and regardless of format, the program starts to play but only white noise outputs thru the RME for about 5 seconds then the Media Center exits. Both 'Audio MIDI Setup' and Media Center point to Babyface and 'Fireface USB Settings' is set to internal clock. The Babyface interface works fine with audio editing programs on both machines. If I missed something, please let me know. Thanks.