For DL media I only use Verbatim DL media, with Panasonic dvd players including an upconverting one I never had a DL back up freeze, I have used 1Click, 1Click Pro, CloneDvd2 and CloneCd. For DL back ups CloneCd is my favorite its quick and easy and does it on the fly.
There is a $50 to $100 upconverting DVD player that Costo sells that many have had problems with pauses or freezing between layers. I cannot remember what brand it is though.