Are you getting an error message on the battle loading screen with your single file XVM config?
It might point towards something that needs fixing
Otherwise you could install someone elses config, and then mess around with it to suit your needs, make a backup, and then have that to copy/paste in whenever you update
And of course, if someone wants to help, that'd be great too (Personally don't have XVM installed right now, and I never had the single file config, so can't really help much on that I guess )