ITunes 9.0.1 forgets Audible authentication

Question

Every time I start up iTunes 9.0.1 I have to re-authorize my Audible.com account. This only happens on my newest computer and only affects the Audible authorization (not the iTMS authorization). The main reason this is annoying is because if I have my iPod plugged in when iTunes starts, it deletes all Audible content from my iPod (and then takes 10 minutes to re-upload the content once it's authorized).
Here is a list of all the things I have checked/tried (in various combinations, as well).
+ Repair permissions
+ Run disk repair
+ Make sure the user has Admin privileges
+ Toggle Admin privileges off/on
+ Create a new Admin user, copy iTunes Library to it
+ Create a new Admin user, download a single Audible file directly from Audible to it (i.e. try it with one file instead of whole library)
+ Reset permissions of iTunes Library (and all subfolders) to insure that user has Read&Write privileges for everything
+ Delete hidden "SC Info" directory in /Users/Shared
+ Confirm a new "SC Info" directory is created when iTunes is opened
+ Confirm a new item "SC Info.sidd" is created in the "SC Info" Directory
+ Confirm that /Users/Shared and all the "SC Info" files/directories have privileges such that "system", "wheel" and "everyone" have Read&Write privileges
+ Reinstall iTunes
+ Delete iTunes .plist files
+ Deauthorize my other computer (in case the problem was too many authorized computers)
+ Reinstall Mac OS X Snow Leopard (did not do what in the past would have been called a "clean install" by deleting the hard drive first)
The computer in question is a Mac Mini (Early 2009). It came with Leopard installed, but I got a separate copy of Snow Leopard. So the first thing I did was set up the computer with a temporary account, install Snow Leopard, then copy my old user profile over from Time Machine. The old user profile had been used on a Leopard-based computer. Then I deleted the temporary profile.
The only other clue I can give is that the Flash Plugin was acting up and the only thing that fixed it was creating a new user and moving all of my files over to that user. So now I'm running everything from this new user account. It worked for my Flash problem but not for this Audible authorization problem.
The only other thing I can think of to try is fully delete the hard drive, install from scratch and set up a new user and don't copy any of the preference files over from the old user(s). Which seems like a huge PITA and still may not work. Any other suggestions?
Chuck
Message was edited by: Chuck444

Answer 1

OK... So I did the whole start-from-scratch thing, and that seemed to work.
Erased the disk, installed Snow Leopard, copied over applications and data, but not preference files. Kind of a pain because I had to reset all my preferences from scratch, but not the end of the world. Biggest PITA was finding the registration codes for those few applications/utilities that need codes typed in. I guess I could have copied those few preference files, but digging them out of the nested folders would have been just as big a pain as tracking down the registration codes. At least this way I have a truly clean install.
Still would have been much easier if I could have found the magic "delete this preference file and restart" fix. Oh, well.