I have a PC.
Since I install the Lightroom when I go in the developpement module, the image is completly red on the principal screen. The navigation picture is OK and also in the détail vue.
I desinstall complitly LightRoom and reinstall, but the problem still.
Any idea for resolve this problem.
Check in LR preferences to see if the Use Graphics Processor box is checked. If it is, uncheck it and try again.
Show us a screen capture.