Operating system and graphics card
OS X 10.12.6
AMD Radio R9 M390 2048MB
Version 2.78(2.78 2017-02-27
Short description of error
Measureit add-on puts up GUI properly but will not show length of line between two points in edit mode.
(Of course, the error could be my lack of understanding of how to use Measureit...
Exact steps for others to reproduce the error
****NEW 11 Sep 2017 The geometry was all created by just adding meshes. The file represents years of not-quite-learning how to use Blender, and I am not surprised that there are multiple copies of some objects, considering the slap-dash manner it was put together over a period of years, if not decades. I very much appreciate your efforts! [[NOTE: I don't know the proper way to answer questions...so I hope you find this.]] *****NEW 11 Sep 2017