Here is some more information.
I tried my movie backups in my Pioneer 585 and my Pioneer blueray LX70A and it works fine. Then I tried a movie backup done on a TDK DVD+R and that works fine. So my question is if this problem is due to poor media, but then, why does it work on the other two Pioneer machines? Or is it possible that my Pioneer DVR-LX60 has some problem with the laser, dirt or if it has to be adjusted?