Hi Spiney
Thanks for your post.
I have a some questions so we can try and figure out what might be happening.
What file format are you trying to render to? MP4, WMV or AVI.
What file formats are you trying to mix? MP4, MP3. JPG etc.
How big are the files and how long is the mix?
Do you know the CPU processor speed of your PC and how much space do you have on hard-drive?
Because the mix renders at lower resolutions I don’t believe there could be an issue with the files contained within the Mix as they would fail everytime ( and it wouldn’t be a memory error) no matter what resolution and would never have passed.
Have you tried to export the mix to WMV and does that fail also?
Aside from trakAx, is your machine running slow or have you had any issues with performance on your PC with Vista recently?
Do you have any other applications running when you try to export?
I look forward to hearing from you.
Best regards
Cormac