When was the last time you restarted your computer? Reboot and test.
Are you on windows or mac? What version of Lr are you on?
windows 8, lightroom cc with new update
Try disabling the GPU.
Go to Edit > Preferences > Performance, uncheck Use graphics processor.
after uncheck this button lightroom no responding and i must restart
1 person found this helpful
Then you will need to disable the GPU by editing the preferences file.
Close Lightroom. With Windows Explorer, navigate to C:\Users\[your username]\AppData\Roaming\Adobe\Lightroom\Preferences
Open the file Lightroom 6 Preferences.agprefs in a text editor, like Notepad.
Close to the end of the file there is a line that says useAutoBahn = true, - change this to useAutoBahn = false,
Save and close the file. Now launch Lightroom.
At this moment it working . Should it be ok now?
Well, if it works, then it works ...
Did you edit the preferences file? If that fixed the problem, you could try to update the drivers for your graphics card, and see if that allows to you turn the GPU back on. If it doesn't, then you now know how to disable the GPU manually.
I'm grateful. Thx
Here is more information from Adobe on system requirements and this known incompatibility: Adobe Lightroom GPU Troubleshooting and FAQ
Unsupported graphics cards