I have exact the same problem...when I remove RXP from the plugins folder Xplane works like it should, no problem at all.
I have been using RXP for over a year now without any problem, and I really appreciate the software, but a few weeks ago Xplane did not want to start anymore when RXP was installed. I do not use Vulkan at this moment so the problem appears with OpenGL
When I check the Xplane log.txt file it shows that it stopped while loading RXP with the following message
[RealityXP.GTN] [INFO]
[RealityXP.GTN] [- ] # win.xpl version 2.5.25.0
I regularly update Xplane11 and my videodriver and my system is as follows
Asus strix Z270H MB
intel I7700K cpu
64GB ram Corsair Vengeance 2400Mhz
MSI 1080 ti 11GB Vram
Windows 10 version 21H1
Not overclocked everything stock
I am really interested if someone has a solution because I have been looking everywhere on the web and cannot find it...
kind regards
Buksey