I can run the app and it works but if I leave it for a while it goes to the background colour. I can right click on the taskbar battle.net and click settings and it opens up properly.
Windows 10, triple monitor setup all on a 1660Ti GPU.
I can drag the window and double click the top to go full screen. It’s only happened in the last few days (first noticed last night). If I close battle.net and reopen it works normally.
EDIT: To add why does the App reload the content every 2 minutes or so now?