OLE Server error in Change event of TextBox control

[Dan M]

I'm getting a strange error "...A problem occurred while
Microsoft Access was communicating with the OLE Server ot
ActiveX control." in all forms whenever I assign an
event procedure to a text box event (whether there is any
code in the event procedure or not) and that event fires.

For instance, I want to evaluate the contents of a text
box on the OnChange event. I select 'Event Procedure' in
the On Change item in the property window for this text
box but don't actually enter any code in this event.
When I run the form and attempt to enter text in this
control the error message above fires (preceeded by "The
expression On Change you entered as the event propoerty
setting produced the follwoing error:")

Regardless of the Event I atempt to assign an event
procedure for, I get the same error. Any code that I may
have in the event procedure fails to run. If I place a
stop on the event it fails to hit this break point and
appears to simply skip over the entire event procedure.

I suspected Norton Anti Virus, but turning off script
protection, Office plug-in, and shutting it down has had
no effect.