Libre Office program selector screen shows "not responding"

I am running Windows 10 64 bit, on my other similar W10 64 bit machine it works fine!
All I get is a blank screen. I have to kill the hung program with Task Manager
If I select any of the programs like Writer from the start button the same thing happens.
Safe mode successfully starts the program selector, I have tried to clear the user configuration but that does not clear the problem. I can use Writer only if I continue in safe mode.
I have re-installed 5.3.7 and 5.4.4 to no avail.
Thanks for any help!