I already checked your file but, we updated the forum software (and moved to a new server too), so it was out of service for a couple of days.
As I suspected, the error is likely caused by having edited the file manually, at the line with a "// Added" comment.
While the simulator itself accepts this kind of comment, C++ comments are usually considered illegal in .INI files (even if it's named .CFG, it's in fact an .INI). There isn't an official standard but, the de-facto standard for comments in .INI files is the colon ; Since we use a standard library to parse .INI files, which of course complies with that commonly acknowledged standard, the file won't read, because of the illegal comment so, our code, instead of just crashing with an error, assumes that if the .INI file cannot be read for any reason, that SSAA is disabled, which is the default.