I havent seen this error before - but would be interested to get some more info on this error (ie. steps taken to reproduce it). I'm guessing in this case you changed the kernel type?The error has been appearing on my computer at work also but it does continue to work after clicking the 'ok' button. The error appears when you click 'open vewport', although it doesn't happen all the time its quite random. I will keep you update, atleast its working though.
Paul