Hi.
I'm having a similar problem. I'm trying to cut very precise parts out of a video (less than half a second) so that I can reorganise them.
There's no audio, so being in sync with that is no problem. I've unlinked and deleted audio.
In the preview window I edit the clip down perfectly using the timer to exactly where I want it to start and finish, then I export it, and the exported video file is of a different part of the original file. Not far off in time (maybe half a second off), but totally the wrong part of the video.
I've updated to pro version 4.0, tried the lossless option, tried different export formats and my computer isn't too bad.
I don't know what else to try. Any ideas?
Windows 7 64 bit
IntelĀ® Core i5 CPU 650 @ 3.20GHz
ATI Radeon HD 5570 Total graphics memory:2779 MB
4.00 GB RAM