I've uninstalled it again and deleted every file and folder to do with mc, and then re-installed and and now it works!
The settings.xml has returned too!
I think the problem was that when it uninstalled, it didn't erase all the files. So when re-installing, if it found an already existing folder called mcThings, it wouldn't rewrite it with a fresh new copy.
I'll keep that in mind next time.
Thanks!