I get the blank (white screen) screen after maximizing from time to time. What I’ve discovered (like others have mentioned above as well) is that if I resize the window it comes back to the Roon screen again and I can use it without having to force shutdown the software. It can even be done with key combination “Windows key + Down”. Then back to maximized screen with “Windows key + Up”.
This is of course suboptimal and it should be taken care of in a future update, but for now I’ve gotten used to this ‘trick’, it works every time and is quick.