For some reason when i use tex tools to pack uvs one of my objects disapears. Then i tried to use the 3ds max version and that did the same thing.I also tried stiching more objects togeather but it would just change which object disapeared. I don't know if this would help but i had 2 objects in the real scene that i stiched togeather and attched to each other so doing as i normaly do i closed the modifer add smoth in groups from uv shells which is in tex tools and then colapsed and opend up a new unwrap uvm modifier.
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Posting in the proper forum section wouldn't hurt, either.
Resetting your Xform usually fixes it-- in my experience.