A Default Value can be overwritten by manually entering new data, so you
shouldn't be having a problem. On the other hand, setting the Control Source
to something, like a value retrieved using DLookup(), cannot be overwritten.
First thing I'd do is look at the Control Source and make sure you didn't
place something there during the development process and forget to remove it.

Is the form updatable, i.e. can you enter and save other data?

Other than that, based on the facts you've given, I'd have to lean towards
corruption of some sort.

--
There's ALWAYS more than one way to skin a cat!

Answers/posts based on Access 2000/2003

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