LibreOffice won't start

For no apparent reason LibreOffice often opens with a completely blank window, apart from the heading LbreOffice Writer. If I move the cursor to where the menu bar should be then shaded windows appear below, where the pull-down should be. The same happens if I click on an ODT file, or try to open Calc.

If I reboot everything works correctly until the next time it fails. I have uninstalled LibreOffice, then deleted all configuration files and cleaned the registry. I then re-installed LO V6.4.3.2 (x64) and the same happens. It opens in safe mode, which offers the following choices:

However, whatever I choose, when I try to open in normal mode the screen is again blank
I should note that this only happens on one laprtop. OO works correctly on other machines.

Need more information, what OS are you using, etc… Sounds like a 64bit version of windoz.

I’m running 64-bit Windows 10 Version 1903