Document windows get stuck at top

I had high hopes for painter 2021 but I'm getting frustrated after just a couple of days,spending more time researching issues than painting so far.

My issue is the document windows keep on getting stacked and stuck at the top left of the interface, so I cannot move them minimise them or do anything other than drag them from the bottom left towards the top right it does not matter what I try, multi view mode, single view mode presentation mode or switching between these and restarting. Sometimes it actually loads with a floating document but the next time I open a file it reverts to this behaviour. Any help would be most appreciated.