Question marks show in the account number field or right next to the account name in the chart of accounts.
You may have installed foreign language packs that appear to interfere with the fonts QuickBooks uses. Korean and Chinese packs have caused this issue when running QuickBooks.
Language packs are installed in the Windows Control Panel under Regional and Language options.
Important: Operating in a non-supported regional setting and language using QuickBooks multicurrency may affect your transactions.
You may need to uninstall/reinstall QuickBooks to correct this issue after clearing the check boxes for the language packs.
If you don't use account numbers, you can turn that feature off.