Hey there! I'm new here and I have the following problem: On my MacBook Air, on every picture, all areas which are pure black are blue! Idk why and this really annoys when I'm editing my pictures, 'cause I like creating pictures with dark nuances.. Thx for ur help!
This is the shadow clipping indicator. Press J once or twice or thrice to turn it off.
Besides the J key, it is the little triangle at the left of the histogram. You can turn the highlights red using the other triangle at the right of the histogram.
Thanks for the trick with the "J"-Button, it worked! And I already feared that I have to reinstall Lightroom. Thx for your help!