I think I may have found the answer to my own question.....found this in the release notes.....which I should have read sooner :-)
The primary screen becomes corrupted or other issues are seen when using the DisplayLink Mac driver on Core i5/i7 systems.
Disabling of automatic graphics switching can help working around this issue.
Assuming the primary display refers to the internal display, and not to the first external display, then I guess this is the problem. I would disable automatic graphics switching, except that this would mean my battery life would be slashed....I guess I will just have to wait!
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