All was fine then I upgraded CCC to 15.7 from 14. something. From then I have had intermittent problems with the Seamonkey browser window going black. If I have several windows open they all go black. The rest of the screen is fine. Also the taskbar seamonkey icon shows the image for each window correctly. If I click on the taskbar image it sometimes fixes the problem. I have installed Seamonkey and reinstalled a new download (same version 2.33.1). This may go a few days and not happen then it may happen 2 or 3 times in an hour.
I think the driver may be problem but everything says its OK. Any ideas?