Which version of Lightroom are you using?
If using Lightroom cc/6 then,Disable use of Graphics Processor in Lightroom.
In Lightroom, Go to Edit>>Preferences>>Performance >>Uncheck "Use Graphics Processor"(Windows)
Let us know if that helps
Please Turn off the Graphics Processor from Lightroom Preferences.
Click on Edit menu
Go to Preferences
Click on the Performance tab
Uncheck the Option for Graphics Processor
Restart the Lightroom.
Let us know if the above steps helps.
it's still done but no
thank you for your answers
Do Help > System Info to find the exact version you are on. If you are on 2015.2 / 6.2 or later, uncheck the option Preferences > General > Show Add Photos Screen, and restart LR. If that doesn't help, then revert back to 2015.1.1 / 6.1.1, as described here: http://www.lightroomqueen.com/how-do-i-roll-back-to-lightroom-2015-1-1-or-lightroom-6-1-1/. Adobe has apologized for the very buggy 2015.2 / 6.2 and recommends rolling back if you encounter serious problems that can't be quickly addressed. Wait until 2015.3 / 6.3 comes out and is thoroughly tested by others before upgrading.