I just tried with with my copy freshly checked out from CVS from the dotlrn-1-0 tag, and it works fine.
That was a typo that slipped in a week or so ago and was fixed by me a day or so later.
Peter, what copy of dotLRN does your installer use?
Can you test this against the latest dotlrn-1-0 CVS version of this file (dotlrn/www/admin/users-bulk-upload-2.tcl) and, if it works, close your ticket?
And if it doesn't let me know? Because it works here, works at Sloan, and if isn't working for you it's a bit of a mystery.