Verbatim is normally a good media, but maybe you've picked up a bad batch
of it. I don't really know what for medias your player supports, but i would
try some other media and maybe to try a +R media with booktype dvd-rom,
not all players like a special brand. My standalone also don't likes media like princo, riteks etc. I never had problems with Taiyo Yuden medias, personally
for me the best one!