I've been running Desktop for Mac (v3188) for a couple of months for Windows support, but I originally I tried it out for running MythTV backend under Linux. It seems neither one of my USB tuners (a Hauppauge PVR-250 USB and a FusionHDTV5 Gold USB) were recognized under Linux. They also didn't show up under OS X, but I expected that, since they didn't have drivers. Can someone point me to further docs about the expanded USB 2.0 support under 3.0?