[CentOS] Centos 5 killing applications

I recently upgraded to CentOS5, and now I have application that
suddenly close. Did not have any problem under 4.x

Applications that crash regularly.
Claws mail [compiled under CentOS5]
VMware 5.5.3 workstation

I see nothing in /var/log/messages.

In vmware-0.log  I have:

May 11 00:18:56: vmx| *
May 11 00:18:56: vmx| * The UI terminated unexpectedly.
May 11 00:18:56: vmx| * If you file a bug or support request about this issue,
May 11 00:18:56: vmx| * please include log and core file(s) from the UI if
May 11 00:18:56: vmx| * available.
May 11 00:18:56: vmx| *
May 11 00:18:56: vmx| Unable to continue without a UI.

Any suggestion on what's causing the crashes.

I have plenty of free disk space 60Gb+
I use NVIDIA 6200 with the NVIDIA driver compiled on this computer

Any suggestion of what I should look for to further investigate?


-- 
Thanks
http://www.911networks.com
When the network has to work