The album artist tag in all my iTunes files (m4a and m4p) are displayed as numbers only:
17773/28001/28277/25964/27749/8264/25027/-20627/11296/18785/28192/17007/29556/29289/25703/25900/8268/25888/17263/28259/25970/29728/25639/16755/29810/-15447/25888/9760/21365/29537/28192/18290/24936/24941
(that should read: Emmanuelle Ha�m, Ian Bostridge, Le Concert d’Astr�e & Susan Graham).
Running 2.8.3 on Windows.