cvs client unable to see files added by TortoiseCVS

[Edward Moon]

cvs server: cvs 1.11.17 on a Redhat Linux AS server
cvs client1: TortoiseCVS v1.6.14 (which uses CVSNT 2.0.41a) on WindowsXP
cvs client2: cvs-1.11.1p1 on Redhat Linux AS

If client1 adds files to the cvs repository using TortoiseCVS, the
added files are not seen by client2 (i.e. cvs update doesn't fetch the
files).

The only way I have found to force client2 to fetch the files is to
issue a cvs -d :pserver:address@hidden:/vault co MODULE/DIR/TO/ADDED/FILES

I've tried updating the client cvs version to 1.11.20 and have not
seen any change in behavior.

Is this an issue with TortoiseCVS/CVSNT or something with the
configuration of the cvs server?

Thanks,