Subject:   -76- After running a few programs, the colors change as the
                cursor moves. The colors are usually all wrong in other
                windows.
Date: 07 May 1993 00:00:01 EST

  This is known as colormap flashing. It is caused by the server
  maintaining 2 separate colormaps, one for GL windows and one for X
  windows.  As the cursor moves around, the window manager will install
  the correct colormap for each window.  This will cause colors to be
  wrong in other windows.  For more information on colormaps and
  installation please see the Xlib Programming manual, chapter 7 (Vol I
  of the O'Reilly series).

  You can sometimes avoid colormap flashing by configuring your X
  Server to use a 12-bit or 24-bit visual by default.