5.0.1 and even 5.1.0 do seem to be a hugh step backweards in some ways, particularly support (or lack of it) for wireless networking. They also introduced some new interfaces that likely woukld keep old configuration files from working right, but Idon't know of any reason that you are having all of the problems that you report. You're the best judge if it's a bad disc, but it doesn't really sound like it is to me. As long as you burned it at slow speed and it passed the verification test when burning it's likely good. If you want to stay with 5.x and don't care about wireless networking, I would think it would be reasonable to try 5.1.0. By the way, I and others are not seeing the 640x480 problem that you have, it might be hardware specific but if 4.02 did a higher resolution I don't know why you shouldn't expect that from 5.x.