Had the same issue, the config for me was under appdata/local/FobsDemo/save
Deleted it and that fixed all my key bind issues.
done, i have delete all game fobs that i have ( old version / demo / shirotane ......) and now it work the M, i have never though it was the save that destroy the game XD
I tested something once I deleted all the saves, it never changes, some maps are very slow or rather, the game slows down, especially the waterfalls.
now the reset to default work this time
for this screen ( if i dont open the menu ) , go below
last question, have all test the key, some dont work, it is something ? (2x A , funny XD )
so the key that dont work is
1 / 2 / 5 / 6 = ?
the 4x left stick and right stick, I'm surprised to see the PS / Xbox controller for a PC game XD