Blank CD/DVD's won't mount

Any ideas? Since upgrading to Tiger I can't burn a data CD or data DVD from my desktop. The blank media won't even mount like in the old days. I understand the 'burn folder' function, but the media gets rejected as unusable. DVDStudioPro and iTunes burns discs fine, so I think it's an issue with FINDER.
I was able to burn a disc image using Disc Utility but those discs aren't readable on the PC's I've tried them on (and they take forever to read on my G4).
Thanks
1.25 Dual G4   Mac OS X (10.4.8)   2 GB RAM

I realize this is a year late but, I've recently been battling this issue for a while and I just fixed this today using this thread as a hint.
The recommendation was to delete the ~\Library\Preferences\com.apple.finder.plist file altogether. I really didn't feel like doing that so instead:
1) I opened the file in the "Property List Editor" application and deleted the two lines that define permissions for CD Burning and DVD Burning. Then...
2) Relaunched the Finder and everything was back to normal.
Hope this helps if you haven't fixed it already.
`Peace,
Aaron
PowerBook G4   Mac OS X (10.4.9)  

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