I don't think that's the problem, Crystal.
Environ$ is a valid function. If it's not working, odds are there's a
problem with the References collection (and so Environ won't work either).
On the machine(s) where it's not working, open any code module. Select Tools
| References from the menu bar. Examine all of the selected references.
If any of the selected references have "MISSING:" in front of them, unselect
them, and back out of the dialog. If you really need the reference(s) you
just unselected (you can tell by doing a Compile All Modules), go back in
and reselect them.
If none have "MISSING:", select an additional reference at random, back out
of the dialog, then go back in and unselect the reference you just added. If
that doesn't solve the problem, try to unselect as many of the selected
references as you can (Access may not let you unselect them all), back out
of the dialog, then go back in and reselect the references you just
unselected. (NOTE: write down what the references are before you delete
them, because they'll be in a different order when you go back in)
Having said that, though, I always cringe when people suggest using an
environment variable to retrieve the User Id, given how easy it is to reset
an environment variable.
Far safer, in my opinion, is to use the GetUserName API call. See
http://www.mvps.org/access/api/api0008.htm at "The Access Web" for a
complete sample.