You are probably using up all your memory because you are loading everything
at once. Either:

Get a lot more memory

or:

Redesign your forms to have smaller recordsets, and then load and unload
forms as you need them.

Dear Jeffry:

I'm no expert, but this reminds me of a problem I once had when I put a
command to requery my form in the form's OnCurrent event. This caused a
loop, and my controls flickered as they were constantly being requeried. Do
you have anything in any OnCurrent event(s) that might do the same thing?

Oh, and if you do a Google groups search with this search term:

Calculating.... Why this error?

you will find a thread in which a similar problem was described, and the
problem was related to mis-referenced controls - but go read that thread for
more info.

HTH
Fred Boer