Please go to the preferences>performance, and uncheck the option for "Use graphics processor".
Restart Lightroom once, let me know if it helps.
You’re the best! It worked. Many thanks
You are welcome, glad to help.
I have same problems. Lightroom is in the develop Modul very lazzy, and instable. Offen short Times my Screen freez and the mouse dosen't do what I want. The mouse move out of controll to places i Don't want. That Problem exist with and without the GPU in the Voreinstellungen. I use a Notebook i7, graphic geforce gt630m in combination Intel HD 4000 and an extern Monitor (qhd).
What is that? With this bullsheet You couldn't work. You need many uneffectiv time.