P: Panels and filmstrip black when switching to Develop

I also have this problem occur occasionally. The only workaround is to restart Lightroom. 

Lightroom CC 2015.12 Build 1125239, macOS Sierra 10.12.6

-Ray

I have found if I double click in the black panel area, when they disappear, that they come right back and stay back for that editing session.

Same for me. I can minimize LR, bring it back. The second I try to do something in LR again, same thing happens. I have to eventually shut down LR and restart it to get at least 10 minutes without dealing with this problem!

LR CC 2015
OS X El Capitan
version 10.11.6

PS this is REALLY friggin annoying to deal with when editing 4 weddings at a time!!!!!

It's still happening for me.

LR CC 2015.12
OS-X 10.11.16

I just made it happen three times in a row by doing Lightroom->About ...  
The panels went black as soon as I dismissed the About pop-up.
It stopped doing that after I clicked the green OS-X button to maximize the LR window.
Unlike other occurrences of this bug, minimizing (yellow button) then clicking the dock icon restored the panels each time.

This issue has started to reoccur on my main editing station. It first started happening a few months ago (reported in this thread), then went away for a while but started happening again this week without any changes to Lr or my operating system from my end. 
This afternoon's Hide/Show efforts to alleviate the problem lead to a new (to me) version of the bug.  All the panels reappeared after hide/show except for the center section. 

Lr CC 2015.12 Camera Raw 9.12
Late 2012 27" iMac OSX 10.11.6 

Andy 

I am still having this issue as well. Very frustrating. Using macOS Sierra 10.12.6 and Lightroom version: CC 2015.12. It happens when I switch library to develop modules and back, also minimize and maximize LR.

El Capitan 10.11.6 not upgraded to Sierra because my Mac Book Pro is a 2008 model, LR CC2015.12.The problem of panels and filmstrip black is recent, I think started around 2 months ago.  Never experienced before

El Capitan 10.11.6 not upgraded to Sierra because my Mac Book Pro is a 2008 model. The problem of panels and filmstrip black out is recent, I think started with the version before CC2015.12.  Never experienced with previous versions.

Thanks for the updated information, I have let the engineering team know that we are seeing it on 10.12.6. 

I'm still have the issue too. Using OS 10.12.6 and LR 2015.12. It happens every single time I minimize LR into my dock and then maximize it again. I am not using full screen.