This used to work in access 97, I upgraded my computer to access 2002; I get "undefined function MID in expression" when I run query.
DISP: Mid([ACTV_STATE],16,1)
You have lost a reference which is a .ocx that provides the function.
Go to modules and open up the code window then go to Tools>references and you will see a list of the references in use.
You will find that one of them has missing against it...
Reinstall that!
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