Thanks. This is what displays:
OPTIARC DVD RW AD-5680H:
Firmware Revision: 3AHB
Burn Support: Yes (Apple Shipping Drive)
Cache: 2048 KB
Reads DVD: Yes
CD-Write: -R, -RW
DVD-Write: -R, -R DL, -RW, +R, +R DL, +RW
Write Strategies: CD-TAO, CD-SAO, CD-Raw, DVD-DAO
Media: To show the available burn speeds, insert a disc and choose View > Refresh
So it's isolated to just iTunes.
With iTunes quit, you could try moving the following to your desktop:
Test. If it doesn't work, you can return those items to the original locations.