The second I pulled the Farm Card from my system, everything went back to normal. Now, it's gotta be this card. Anyone know if the following revision has any problems working with PT 6.4.1 on a dual 1.25 G4 with a Mix Core Card? FAB: 941005520-00 Rev B Asy: 915005520 02 Rev B Serial No. IN01676 Also, with the Farm card installed, Digitest (when it runs - it will crash sometimes near the end of the test with the Farm card in) will report this DSI error: -1 and won't run. What is this DSI?? Never heard of it in 7 years of using Pro Tools. Any help is much appreciated. Siegfried