What make and model burner do you have? What are the mid codes on the +R disks you have been given? You can check the mid codes with DVDIdentifier or Nero CD/DVD Speed (Disc Info tab).
It may be possible to bitset the +R disks and make them appear to be DVDRom's to your player, thus increasing compatibility, but we have to know make and model burner.
Updating firmware for your drive is another possibility.