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[Rudolfo Dalamicio]

Today I wanted to export an image and the buttom half appeard completely black.

When re-opening LR classic, editing images give a strange black/dark view on all my images.

What happend? 

thanks for taking the time to reply and give a sollution. ps running on version 11.4.1

[Rudolfo Dalamicio]

Update: after restarting my system/ mac the problem has disappeared, but i seems liket this issue came back as I have had the same issue before and in the mean time, my system was restarted multiple times. 

[johnrellis]

Intermittent issues like yours are typically the result of a buggy graphics driver or failing hardware.

You're on Mac, so it's less likely a problem with a graphics driver (which you can only update by updating Mac OS), but you could try setting Preference > Performance > Use Graphics Processor to Off for a while to see if that's the cause (and if it is, wait for a new release of Mac OS to update the driver).

It could also be intermittently failing memory or disk.  Google for how to run hardware diagnostics on Mac, especially for memory.

[Rudolfo Dalamicio]

Hi John, thanks, my macbook has enough memory for some actions, but yeah, it looks like something like this.

I have 20gb free memory and 250gb worth of disk space available.

I turned the option to off for now, and see what will happen. thanks

ps: always running cleanmymac