I import a file into Lightroom click on the Develop button but the screen is blank. If I click on before and after vies the picture is there but not for developing. This is an intermittent fault but now I have a wedding shoot to work on it is really annoying :-/
Try to disable the GPU.
Preferences > Performance > Uncheck Use graphics processor.
I did a load of work today with no problems. I'm back at it tonight, so far so good. Hopefully this is the cure. Thankyou very much for your help :-)