waveforms suddenly disappeared

Cubase
#1

never happened before?
Is it a bug, or a setting somewhere?

Screen Shot 2018-06-17 at 10.07.08 PM.png
Screen Shot 2018-06-17 at 10.07.08 PM.png1142×426 32.3 KB

#2

https://www.steinberg.net/forums/viewtopic.php?t=138603

#3

thanks!