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Description of problem:
Application windows disappearing when moving them in RHEL. 

Version-Release number of selected component (if applicable):
RHEL6.3-20120416.0

How reproducible:
100%

Steps to Reproduce:
1. Install RHEL6.3-20120416.0.
2. Open up a terminal window.
3. Drag window from title bar.
  
Actual results:
Windows disappearing from view.

Expected results:
Windows can be dragged around the desktop.

Additional info:
Showed ajax what was happening.

lspci -nn | grep VGA

1c:00.0 VGA compatible controller [0300]: Matrox Graphics, Inc. MGA G200e [Pilot] ServerEngines (SEP1) [102b:0522] (rev 02)

Created attachment 579009 [details]
Xorg log file

Created attachment 579010 [details]
dmesg output

Need to default to shadowfb for randr 1.2 support.  Fix in hand, devel ack.

This request was evaluated by Red Hat Product Management for inclusion
in a Red Hat Enterprise Linux maintenance release. Product Management has 
requested further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed 
products. This request is not yet committed for inclusion in an Update release.

Verified with xorg-x11-drv-mga-1.4.13-7.el6.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHEA-2012-0940.html