CVS SCC - Can\'t check in - Problem with temp files

I am having some problems with my .Net project, but I really don’t know if
it is caused by the SCC Plug-in, the CVS NT client or the server.

This is what i have done:

1. Project created within Visual Studio .Net.
2. Project added to source control; module created within SCC
Plug-in.
3. Some file checked-out, modified and checked-in again.
4. Project opened from source control on another developer machine.
5. On the other machine, some file checked-out and modified. When I
try to check-in, this error message appears: “cvs server:
C:\\WINNT\\TEMP\\cvs24.tmp: No such file or directory. cvs
[server aborted]: error diffing Default.aspx”, and then this one:
“Check In: The operation could not be completed”.
6. When I try to do the same on the first machine (the one in which
the project was added to source control), I get the same errors,
(but always with a different temporary file name).

The version of the SCC plug-in is 2.0.8_050927; the version of CVSNT is
2.5.03 build 2151 (on both, clients and server).

My CVSROOT is :pserver:xavier.muniz@multivac:/Data/CVSRoot, and the module
name is SAEPCAEP. The plug-in asks for password when openning the project.

Thanks.

-Xavier Muņiz.