Right disabling the addons one by one makes no difference I still get random black boxes but using the "Disable Addons" from the help menu and going into safe mode seems to cure it, so what else does safe mode disable? I notice my menu has disappeared in safe mode.
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It was that but I have also upgraded to V37 and turned hardware acceleration back on but someone has filed a bug that V37 has a graphics crash bug so auto updates have been pulled. Also I have used Guru3d driver sweeper and re-installed the latest nvidia drivers.