CVS hangs on certain files

[Kyle Adams]

Here's an odd one:

One of our developers is having difficulties committing five of his
files.  The problem files are all in the same directory.  Here are the
facts:

* The files in question are text files, Java source code.

* The clients in question are JBuilder 7, Tortoise CVS 1.4.5, and
WinCvs 1.2 & 1.3.  The server in question is CVS 1.11.5.

* The problem is not just with committing - any CVS operation on those
files hangs.

* General CVS commands, like logging in or doing a checkout, work fine.

* The files are all in the same directory; however, he can commit other
files in the same directory just fine.

* I can reproduce the problem in JBuilder's CVS client, WinCvs 1.3,
CVSNT (command line), and TortoiseCvs.  Doesn't seem to be a problem in
a specific client.

* I can reproduce the problem in a clean checkout of the module.  I
checked the module out to an entirely different directory, copied the
modified files over, and attempted to commit.  CVS hung.

* After transferring the same files to my machine, I was able to commit
them no problem.

Anyone have any idea where the problem might be?  If it's a network
issue, why does "ping cvs.servername.com" or any of the other CVS
operations work fine?  If it's a problem with the CVS setup on his
local machine, why isn't it fixed by using a different client, or
switching to a clean checkout?  There are no CVS-related environment
variables set, so there's nothing there.  If it's a problem with the
files themselves, why was I able to commit them successfully?  Alas,
I'm befuddled...

Thanks,
Kyle