I can report this problem is still in this build----> http://isiforums.net/f/showthread.p...update-fails-in-build-494?p=253402#post253402
Well, if the duplicate mas files truly are the exact same file, you won't get this report. But if they are actually different mas files with the same name, then you must rename one or the other for the mod to install correctly.
I see, I think that error message should really be directed at the track maker making a update to his track, not to the person making a vMod for his server. Thanks for the answer. DJC