Anyone ever seen BI5 only producing a white screen in browser?

The console seems fine. Latest version of BI installed.

I've had it with various FireSticks running Silk browser having UI3 as the only bookmark, so they start up with UI3 by default. It usually means I have to go to the menu and select the UI3 bookmark again and then it loads normally. Probably seen it five times in the last couple of years.
Anybody else ?

I'm actually using a Brave desktop browser. But I am using a bookmark.

Update to BI yesterday made the problem go away. Maybe just overwriting a corrupted file or maybe an actual bug. Regardless. Back to normal ops.