Any DVR-900A owners here who have actually persuaded it to play DL disks?

I have some Dual-layer DVD+R disks that I have created on my PC, but my DVR-900A doesn't seem to recognize them ("No Disk"). Can anyone here confirm that this unit will play DL disks? I'd have thought it would, but I can't get a definitive answer from anyone about this. I am currently using Verbatim DataLifePlus 8.5GB blanks.

Thanks.