Hi Ed, I get exactly the same problem with just the Mix card installed. I had a very brief chat to Magma on Friday and he said for me to check the revision number of my Mix core card. Was there a revision update for the Mix core cards ? As soon as I play any audio ( even 1 track ) my PCI performance meter goes to 3/4 full and then after about 1 1/2 mins it goes into the red and then I get the -6042 error. Whether I play back audio from my internal Powerbook drive or from the OWC Firewire drive the problem is exactly the same. Thanks.