(was about to post this community dev section, but feels like it's more useful and proper in here)
This might be a bit late, but has anyone ever use JSon for saving game values? I noticed that the dev still has problem with saving skirmish game settings. Maybe if config settings refuse to work, you can use this instead.
And if not, this can still be worth looking out suppose there's a feature that needs game saving, like K/D, building destruction records, tutorial, single player campaign mod and whatnot
https://udn.epicgames.com/Three/Develop ... tates.html
Last time I ever tampered with JSon was when I was playing around with SonicGDK, a Sonic fangame based on UDK. The save system is actually less complicated than I imagined