Bill,
After much of a search and driver trials, I finally
found that my video card was the problem. Not an easy item to determine as the
problem was so minor that it did not appeared in other programs under 16 bit.
After pushing it to the limit, It started to failed
in certain graphics using texture and OpenGL.
I replaced it with a new one, problem
solved.
It is a refresh failure within the video
card memory. I am glad it is fixed and it was not Guide. It became obvious
to me after a few attempts the reload Guide from scratch that if the problem was
in the program, It would have been reported a long time ago. This weekend, I
took a different approach and looked for a harware problem. It took me a
while to pinpoint it but I found it.
Thanks all for your help.
Denis