I'm afraid your diagnosis is wrong, this has nothing to do with UMM at all.
You mostlikely also installed Targetable Plasma Streams (or something where TPS is part of) without installing all the requirements, in this case, NanoFXv2 Beta.
I think the thing is, you didn't test BC through enough (mostlikely just the mutators?), and after UMM you did go further.
(Please, don't see this as critisism (sp), just something for you, and others, to keep in mind).
Or, at the very least, something went wrong with the installation of NanoFXv2, so try to reinstall it anyway.