What I've noticed is that if the original recording is not good, then the VideoPad-edited one will be out of synch. If I record onto my pc and the connection is interrupted by my doing other things on the web, gliches will show up on the edited film clip when I move the time thingy along.
This should be able to be corrected in VideoPad, I'm sure. But because it's free I think it's only good for basic editing and not 'repairing' stuff.
I'll be sure to post here when/if I find out any more info....