So there could be a bug that only manifests in a compiled version?
The only branch in my code that differs from compile to ahk version is the bit that strips the suffix from the file name to generate the INI name.
Everyone can run the ahk version just fine.
I am 99% sure that your psychic powers are accurate - I had a hunch that it was something to do with UAC, and the game concerned does indeed run as admin. Some users also reported they could get the app to type keys in notepad, but not in game, which would corroborate this theory.
I will take a look at the link you posted, but I do not think it is appropriate in this case.