When I previously uninstalled the software, I checked to ensure it really was gone by refreshing (and rebooting). But to leave no stone unturned, I retried today and did everything as described (which is what I did previously anyway). I got the same result with the flashing screen.
I did the uninstall again, this time ran regedit and deleted all entries relating to displaylink, there were some that I couldn't delete though. This time the problem was very much the same, except this time if I try to switch to "duplicate displays" the flashing stops for a second or two, my laptop display goes to low res and then it switches back to "extend displays" and my laptop display reverts back to flashing high res....
I will keep trying to play with it and post if I manage to become successful
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