tonyjag wrote:
I am learning LightRoom classic and have encountered a problem. It had been working, but suddenly in the develop module, the image goes black while moving sliders, e.g. to adjust exposure. After you let go of the mouse button, it comes back with the intended change, but it's hard to compare with the previous state. I searched, but didn't find anything. Any advice will be appreciated. LR version 9.1 on MacBookPro with Mojave OS 10.14.3.
Stuck "Alt" key on keyboard? If you hold the Alt key down while adjusting exposure, you get the black screen you describe. I have never used it with the exposure before, but I always adjust the unsharp mask using this method.