Blank DVDs and CD-Rs No Longer Appear

Since installing the latest security update for 10.3.9 on my 1.8 Dual Processor PowerMac (yes, I repaired permissions immediately before and after installing the update) blank recordable media no longer appear in Finder or on the Desktop. I am able to use iTunes and apps with the ability to burn to record some things and the discs behave normally, but I can no longer insert a blank disc and copy folders or files to it to burn because it does not appear anywhere on the system. Named blank discs do not come up when I use Search either. These are the same batch of discs I have been using for months with 100% success (Imation brand of DVD-R and +Rs), and like I said, they work fine through certain apps that have a burn function. Seems like a Finder issue to me. Any thoughts?
When I insert a blank it get this error in Console:
Apr 25 11:35:57 ####-####-Computer kernel: disk4: media is not formatted.
My optical drive is a SONY DVD RW DW-U10A
Here is a list of what I have done in an attempt to resolve the issue:
-repaired permissions
-in System Preferences set the action to open Finder when blank discs are inserted (tried changing settings and restarting)
-used Onyx to clean system and app caches
-put machine to sleep and woke it (read somewhere this might do it)
-trashed the finder.plist file
-used Panther install disc to verify and repair the Volume (says all's good)
-downloaded the update again and reinstalled
My three external firewire drives all show up as usual, and USB CF cards mount normally. Recorded DVDs and CD-Rs appear normally.
In Disk Utility I see the disc icon with the name of the optical drive when there is a blank disc in the drive, but it says under Total Capacity: 0Bytes, and under Write Ability: Read Only (CD-R).
Any thoughts or ideas on what I could try will be greatly appreciated! I really need to burn some backups!
Thanks very much,
Kevan
15 1Ghz TiBook 1GB RAM: Dual Processor 1.8Ghz PowerMac G5 w/ additional 300GB Maxtor Drive Internal Mac OS X (10.3.9) 160GB and 300GB externals; 10GB, 40GB, 60GB iPods
15 1Ghz TiBook 1GB RAM: Dual Processor 1.8Ghz PowerMac G5 w/ additional 300GB Maxtor Drive Internal Mac OS X (10.3.9) 160GB and 300GB externals; 10GB, 40GB, 60GB iPods

Alright! I have it fixed using a little deductive reasoning and a post by Roam on another thread. Thanks roam!
Resetting Launch Services did it. Here's a link on how to do it:
http://www.thexlab.com/faqs/resetlaunchservices.html#Anchor-Reset-11481

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