I've uninstalled v3.4 for now, might reinstall it again later. Even better if CS could release an v4.x update (hell, I'd buy the B-52 again in a P3Dv4.x version).

The radar display is kinda annoying yeah. There was this mod that uses the F-35 HUD symbology for that screen, that worked reasonably well, but I can't remember where I found it. I used that, and it was better than staring at a blank screen...
EDIT: It was Mustang1977's mod, further down the B-52 pages: https://www.captainsim.org/forum/csf.pl?num=1487607209

I had the same issues after every B-52 flight, that it modified some files that made v3.4 not start up again afterwards. Don't remember the exact files here and now, but I made a shortcut to the relevant folder, and made a habit of deleting the offending files after every B-52 flight. That worked like a charm.

But once again, CS needs to update the B-52 for v4.x...  :-/