Why did my GarageBand stop exporting to iTunes

I have been using GarageBand on my PowerMac G5 and exporting to iTunes for 5 years succesfully. Today it just stopped working. I click "Export to iTunes" and nothing happens. I have checked all my settings in both iTunes and GarageBand and nothing seems to help. I even deleted GarageBand and reinstalled and still no change. I havent updated iTunes either. I don't know what could have changed or why this is no longer working.