Try:
X -version
I get the following on my 10.1 box
[tom@compaq tom]$ X -version
X Window System Version 6.8.2
Release Date: 9 February 2005
X Protocol Version 11, Revision 0, Release 6.8.2
Build Operating System: Linux 2.6.3-25mdk-i686-up-4GB i686 [ELF]
Current Operating System: Linux compaq.stillwater 2.6.8.1-10mdk #1 Wed Sep 8 17:00:52 CEST 2004 i686
Build Date: 02 May 2005
Before reporting problems, check
http://wiki.X.Org
to make sure that you have the latest version.
Module Loader present