OK, seems to be the render mode that is doing it. So the control was originally set to lightweight. If I change the render mode back to classic then it displays as expected. I can only assume that in the previous version I was using it made no difference, but in this latest version it does.
That raises the question of why it looks so different? I like the idea of a light weight control, however there is so much padding space it looks ridiculous on the screen
Is this by design, can I have a lightweight control that looks identical to the classic one, otherwise it might as well be another skin entirely.?