This is an old thread but I never followed up to say that I was mistaken and
did NOT fix it. The symptom was revealed immediately after my last reply.
I now have another computer on which Office 2007 is installed (it never saw
the beta version) and it has the same symptom.... Ctrl+Backspace puts out
squares half the time.
Jon
"Jon Davis" wrote in message
...
I'd suggest that you close Outlook, and rename your NormalEmail.dotm
file. Outlook will create a new one when you reopen it and that might
take care of your problem.
Thanks for the advice. That seems to have fixed it!! 
Jon