Here are some things to note when I try burn:
"Could not complete the command because of a MacOSX error. Reason code = -32030"
Interface error -32030
The connection is not stable
(the system will crash at this point and I get the screen telling me to restart the system)
I was able to burn on 1 attempt a cd from iTunes.
I've tried using different brands of media (Sony, Memorex, JVC) and different types (CD, DVD, DVD DL). No matter, it all fails.
I've tried re-installing Toast. I've also tried deleting the preferences file. Problem persists.
I suspect this latest version of Toast is not compatible with OSX 10.5.6.
I am bringing my system to Apple tomorrow for an unrelated issue. I did call Apple today about this issue and they suspect it may be hardware related (let's see if the Genius at the store agrees).