Got the same problem. I have 1946 installed over my previous FB/AEP/PF installation and it worked fine. I had the MAT Manager 2.33 and it worked fine as well - I guess because I had an old il2.exe in that folder...
Well, I then upgraded the MAt Manager up to version 2.36, alway deinstalling the previous version.
No chance.
I renamed the il2fb.exe as told here and in serveral other threads - nothing happens.
I started all over again, testet it step by step. 2.33 is the last version that works, 2.34 or above does not.
When I start 2.34+, serveral markings are changed in the GUI, for example the staff markings for german fighters are a white "1". No matter if i press "Quit" or "Launch FB", the program does not copy anything, in the game I have the default markings only!
Yes, I have "clear cache = 0" and write enabled folders...as I told above, it worked fine with version 2.33!
Any idea, any suggestions?
...an install programm for 2.36 complete would be great...