Blank DVD+R won't mount, always ejects

After installing Leopard, any blank DVD+R that I insert won't mount, it makes noises and always ejects -
yet
1. I can read the Mac OSX Leopard DVD and have installed it.
2. Blank CDs mount and can be burned. And they play as well.
This appears to be happening only after installing Leopard. Help, anyone!!

The specs for this drive are hard to find, but this came up with some Google searching:
MATSHITA DVD-R UJ-835E:
Firmware Revision: GAN7
Interconnect: ATAPI
Burn Support: Yes (Apple Shipped/Supported)
Cache: 2048 KB
Reads DVD: Yes
CD-Write: -R, -RW
DVD-Write: -R, -RW, +R, +RW
Burn Underrun Protection CD: Yes
Burn Underrun Protection DVD: Yes
Write Strategies: CD-TAO, CD-SAO, DVD-DAO
Media: No
This would indicate that this drive does not support double-layer (DL) DVDs. You can confirm this by checking the specs for yours in System Profiler.
bd

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Blank DVD+R won't mount, always ejects

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