avi files out of sync

[slkx]

What would cause in-sync avi files to be out of sync as vob files after being put through Ulead DVD Movie Factory 3?

I tried a batch on my machine and a friend who also has MF3 used the exact same files for the same result. We both are in the land of PAL and AC3 sound. No editing is done in the program at all.

And we're not talking a little out either -- we're talking over 2secs out.

I rarely have out of sync problems in mpegs.
PS we're both up to date on all patches and downloads.