Gary,
At the moment I don’t have any ideas. However, if you would render a 10 second clip from each machine, verify the problem exists in the new clips, and then put them somewhere I can get them, I would check them out. I have 5 video editing machines, 3 with Vegas and one of them is 32 bit.
I just want to check… have ever loaded a codec pack on either of your machines?
Jeff
2-Xeon X5680 @ 3.33, EVGA SR-2 Mobo, 48GB DDR3, GTX 580 3072MB, 16TB Attached Storage, Win7, Vegas 11 x64