The panels at the top, bottom, left, and right in the Lightroom user interface become 'black' intermittently when you perform actions such as switching between Lightroom modules, or minimizing and maximizing the Lightroom window.
The Lightroom team has made attempts to resolve this issue to a large extent, reduce its occurrences, and recover from it automatically in case one may still hit this issue. If you're running Lightroom on older Mac OS X 10.11 version, the issue may still appear at times. Try out the latest version of Lightroom and let us know your feedback.
To correct this problem:
- Update to Lightroom CC 2015.10/Lightroom 6.10 or later.
- Update to macOS Sierra 10.12.4 or later.
Workaround for macOS 10.11 and earlier
When the Lightroom panels appear as black on your Mac, follow the workaround steps given below to resolve this issue: