iTunes 11.0.4 Download Released with Bug Fixes
Apple has released iTunes 11.0.4 for download which contains a crashing bug fix and login issue:
This update fixes a problem that may cause iTunes to quit if you switch between wired and wireless syncing and addresses an issue that may require you to log into the iTunes Store repeatedly.
This update comes just over two weeks after iTunes 11.0.3 was released, which included a new MiniPlayer, improved songs view and better multi-disc albums support. You can find the update by going to the Mac App Store, then clicking on the Updates tab.