Actually, anything that prevents new records from being added, in conjunction
with an empty recordsource, can cause this problem. A non-updateable query,
as Arvin suggested, or AllowAdditions set to No.
Also, in Access 2003 running under Windows XP, if Windows XP themes are
active, all kinds of strange problems can occur and they seem to multiply
when tabbed pages are involved. IF this is your situation, you can try right-
clicking your Windows XP desktop, choosing Properties, and setting the Theme
to "Windows Classic". Also, Microsoft reports this issue is fixed in Service
Pack 3 for Office 2003. Just remember, if you install SP3, install the hotfix
as well.