tvscreen, When all else has been examined, Make sure the original source, be it a DVD disc or online download is in good shape. Clean your disc media of finger prints particularly the source DVD because this can allow for you to back up a bad copy which will only multiply as you seek to make duplicates. This can easily be overlooked as the reason for the problem you described and can be the easiest solution.
That nero speed test won't really show you much unless they are horrible burns. Try to download the free version of dvdinfopro. It can be a pain to download it,but there is a PIE/PIF error scan test in that program. Use the dvd-rw drive that burned it to run that scan. You can get it here: http://www.dvdinfopro.com/
When copying a DVD, if the original DVD is dirty (a library copy for instance) could that create a copy that freezes or skips? I have started cleaning every DVD with a dvd doctor cleaning product, getting rid of all scratches and finger prints and I believe i have had a lot less glitchy copies anyone have that result?
it's about 2 months old, its always seemed to have problems but i thought originally it was bad dvds in case your wondering, i built it myself i redid the family guy dvd that was giving me problems and it seems to be better but not perfect, but i wasn't able to watch the whole thing to see if the green squares appeared. the only thing i did different was i had just defraged and i used nero to do everything, compress and burn
slight update, my newish girlfriend turns out to be a whore, but not with me so i'm busy fighting with her and neglecting the dvd problem, look out this thread will be back, at least with updates you guys have been great, thanks for the help so far