There's a polygon limit on the insignia. Each one needs to be no more than something like 8 or 10 polys, but you can have as many of them as you need. Make each insignia piece its own subobject first and try; if that doesn't work then you'll actually have to break them up. At any rate, this is an engine problem, not one with the converter (other than that it doesn't check or warn you in some way).
And the only potential problem with the insignia UV would be it being backwards for some reason. Probably needs to be within the [0,1] range but I don't think that's your problem.