I'm running a MacBook Pro with 10.6.8 OSX and I've recently started having problems with my Fireface UC. The unit is connected, the drivers are installed and there is no "error" (error LED is not lit), but I still cannot open my TotalMix mixer or my USB setting. My Mac audio settings and Ableton Live recognize the interface as I can select it from the menu of audio I/O from their preferences, but I still cannot get audio out. I suspect the interface may be in PC mode. I tried setting it to Mac, but when I double click the knob on the interface I can only ever see "PC" it never changes to "AP". Any insight???