Never give up, never surrender! 
For X-Plane, I know I am in danger of ‘I just did that’ terroritory, but I have to ask. 
Did you already:
- Run the X-Plane Updater?
- Delete the Output/preferences folder in your X-Plane install directory?
XP11 seems very tied to what hardware you have, and will ‘tune’ itself fairly aggressively, i.e. cores, GPU, amount of RAM etc. There must be something that is trying to use your previous hardware profile. Blat it!
Re-Installing things often doesn’t work - all it does is put the same files back on. The trick is to find all the ‘settings’ files that get written after a hardware profile has been read on start-up and then default those puppies back to ‘go do that again’ settings.