> They say they enter data in the record, check it, everything's fine. Then,
> sometime later, they go back and look at the record, and it has data from
> another record in one or two fields. It's happening about once or twice a
> month now.

With this description I would guess, that two users are entering the same
data at the roughly same time. Does the table has a unique id, and perhaps
an identity column?

/Sjang