nUI6 will get a range indicator in due time. Not yet though as there are other parts of the unit frame system I want to test first.
As for having the latest version of nUI5, that may be, but that does not mean that it is not being broken by another addon. Carefully and accurately follow the directions given in this post and it should help you fix it:
http://www.wowinterface.com/forums/s...90&postcount=1