@Nuss
There does seem to be some sort of problem there (when I uninstall the Ubermod, SH3 commander no longer reports "Error!" as the 8/39 7th Flotilla base, though it still doesn't mention a place called "Memel"). I'll look into it.
@andqui
Just enable OLC GUI 1.2.3 over the Ubermod (so enable the Ubermod first and then the GUI) and it should work fine.
It looks like I'll shortly be releasing 1.1

(if I can find and fix this Memel problem) so when I do I'll seperate the Ubermod into two seperate JSGME mods, for convenience.