I has happened a few times in the year on my laptop, WITHOUT any hardware connected. When I launch the software and load a show file (3 universes), it doesn’t let me see anything on 2D plan, neither playback nor programmer. Then I load another show file (1 universe), and the same thing happens. In both cases I looked at the Patch screen, and there was a message in orange on the left panel (I forgot to printscreen), saying that I was exceeding the number of universes and an orange padlock icon on every fixture, which is nonsense.
The problem goes away restarting the software.
I don’t always carry my controller everywhere, and I find very useful to be able to do programming in a coffee shop or anywhere else. Please always keep this functionality.