Good to see you posting again Browners.
Could be a number of things,
1. Damaged memory (do a memory check)
2. Conflict with other software or corrupted codecs. Is there any consistency with the fault. Is it always when opening a file or when rendering?
3. Damaged disk or temp space. Unlikely, but clear all temp files and perform a can disk
Hope that helps a little. You could aldo try sending the dunp fiel to ULead support for analysis.
COMPAQ something or other with 500Gb Boot Disk, 1Tb external Firewire Disk, 4Gb Memory and a super duper sound card, 19" TFT Monitor etc etc etc
Sony TRV33e : Sony TRV310e : Canon XM2
Sony Vegas Studio editions to v11
Remember, there is always more to learn than there is to teach.