That is typically a GPU problem. What is your OS/CPU/RAM/GPU data for that computer? In your Project settings, are you set for Mercury Acceleration, and if so, which option? Does this improve (if accelerated) by going to Software only mode?
And if it is a GPU issue, manually check for having the latest driver by going to the manufacturer's site and checking driver numbers for that card.
Neil you are a lifesaver! I don't pretend to understand what the difference between Software only mode and GPU Acceleration are but that fixed it! Thank you very much.
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Same issue after Intel graphics driver update in March - I rolled back to earlier version. April windows update pushed the new Intel driver out again and problem came back - once again I rolled back to 2017 driver to fix the issue.