I made a copy of a copy created by DVD Shrink and Nero. The 1st copy plays fine in my PC DVD player, as well as my stand-alone player. However, when I copy my copy, it will not play in the PC, but will still play fine in the standalone player. Any ideas what would cause this? I am using memorex media (the ID shows up as G05) and a pioneer 16x burner. If I need another copy I guess it would be better to use the original, but it is much faster not having to decode and recode the DVD again and I was just curious as to what could be happening.