This conversation has been merged. Please reference the main conversation: Lightroom 2015.7+: Panels and filmstrip black when switching to Develop
Not sure if it's a random key press that I've been doing - but I'm pretty sure it's not. I've tried show and hide to get them back - but they aren't actually hidden. They are just blank. Only way to return them, is to restart LR.
I have a colleague reporting exactly the same issue on his setup.
I'm on an iMac 2015 5k retina. AMD Radeon R9 M395 2048 MB