Just upgraded to 6.95.2 / beta 2 and now the issue is gone.
I upgraded by downloading the Rasp2 file LibreELEC-RPi2.arm-6.95.2.img.gz, and uploading the ungzipped img file to rasp:/storage/.update
On restart the img file was detected, mounted, installed, rebooted.
I am happy again 
Maybe a known one: I upgraded from the recent beta OE to LE: upgrade went fine and GUI is fine.
Only, video playback gives black screen. Subs are shown though. Overlay (like info, bitrateinfo) are also shown. Sound is playing OK.
It is just that I do not get to see anything. Oh, same when connecting for Live TV to my dreambox PVR: also played black.
