Not sure if this has been discussed, couldn't find much in a search. I'm having problems with a new Imac and new FF400. Won't sync or work at all. I have a Pleiades Icecube external hd that works flawlessly, tried piggy backing off this - no good. The FF400 appears to work fine with the previous model Intel iMac (same software, Logic 8, etc). Latest firmware, drivers, fully updated OSX, reset iMac, no joy. Any suggestions? I'm almost ready to return the iMac to Apple! RME forum workaround doesn't seem to work for me. Haven't tried using a FW Hub though. Cheers, Nado.