I'm sorry, I must be terribly dense. Well, actually, just trying to wrap my head around the procedures in MOI. I can't figure out how to use that nifty plug-in.

I drew a couple of lines on one plane, and then activated the plug in to MarkUnmatchedCurveEnds, but I couldn't see anything happen on the drawing. I could click on the lines and they turned yellow, but nothing else. Didn't matter if they intersected or not.

When I launched the plug-in, an information box popped up in the upper right, which SEEMED to be asking for an input (i.e. "Tolerance") but I couldn't figure out how to use that box. No amount of clicking anywhere in that box did anything.
And then the computer "hung" for half a minute... I was almost ready to do a hard reboot when it finally came back.

Michael, you have my great respect. You obviously know the API for MOI inside and out; I looked at the JavaScript and although I don't understand it, it's obviously a masterpiece of object-oriented programming. Are you one of the developers of MOI?

If it matters, my computer is running Windows 10.