It’s possible that your problems are related to the use of poor quality media. Imation 52x CD-Rs are probably made by CMC Magnetics (at least those I have used seem to be), which generally work with most writers but have shown two problems for me :
[li]Some CD-ROM drives seem to have problems reading these discs after burning
[/li][li]The top coat of the discs peel off at the edges after a while
These are not the signs of quality media in my book.
Best media also sounds suspiciously dubious to me. Since you can get hold of Verbatim CD-RW discs, I assume you can get hold of a Verbatim DVD+/-RW disc as well for testing purposes. See if that works with your writer. If it does, then it’s probably just poor quality media.