P: Panels and filmstrip black when switching to Develop

El Capitan is pretty old. You shouldn't hit this issue in Sierra or High Sierra.

Still having this issue after updating to the newest MacOS and version of Lightroom Classic:

El Capitan 10.11.6

LR Classic 7.0.1

Mac Pro (Late 2013)
3.5 GHz 6-Core Intel Xeon E5
64GB 1866 MHz DDR3 ECC
AMD FirePro D500 3072 MB

Finally this problem has diminished for me.

Since no other software that I know of has this problem with macOS, it seems to me that the bug is a problem with Lightroom, not with macOS, and Adobe should be able to fix their software, if they stake some responsibility and care about their customers. Terrible behavior from Adobe to simply push this off onto Apple, or onto customers to upgrade their OS (which may or may not actually work).

I continue to have this blackout problem on El Capitan 10.11.6 for many months, thru multiple Lightroom versions.

I never had any blackouts when I was using LR 6. The stand alone product.  This seems to start when Adobe went to LR CC. 

WOW Mr Chen-"You should trust the experts from Apple and Adobe in investigation the issue."  That is quite a statement to make from a company that has NOT made significant progress in dealing with this issue for I do not know how long.  There have been more than a few with that configuration or one very similar that CONTINUE to have these issues.  PLEASE do not throw the expert card out unless your companies willing to step up and resolve these EXTREMELY long standing issues that have crossed over multiple OS and LR updates that never quite fix it.  THAT is very disingenuous of you.  

Hi Steve, macOS 10.13 + Lr Classic CC (or Lr 6.13) is the best combination for the fix. 

Hi David, Except in this case, Lr has no part in rearranging the Windows when the black panel bug happens. It happens transparently to Lr. You should trust the experts from Apple and Adobe in investigation the issue.

From what I have read in the previous replies, LR still has the problem in Sierra.

Actually no--I don't understand this situation.  So let me get this straight--Apple has a bug in their OS that only affects Lightroom---to me, thats not a bug, thats a microscopic creature that doesn't effect anything but your software.  In other words, I don't buy you passing the buck.  Using your criteria, should I assume that it's Apples fault that your product runs so slow and seems to be aggravating more people daily? Is it Microsoft's problem too?  Just fix the problem--it's been going on for way to long.