Dump the Memorex.
They switch manufacturers more often than you brush your teeth and so quality varies from stack to stack. And even if "...theyve always worked best for me... ", they will rot and fail a year from now. Try
Sony -R (1x-8x) since they are available in most local electronic stores. JVC's love Sony -R. Set the burn speed, in
CloneDVD, to burn at 4x. You may not need to do
anything other than that to fix your player compatibility problem.
Best regards,
Whisperer
Gotta go to work now, others will help if, after you get back from the store, you are still having problems.
PS: You have nice equiptment, by the way. So that is not your problem.