I cannot give exact steps to reproduce because I cannot get out of this. Even restarting RHINO does not make it go away. However, I presume it occurred by doing a match with MERGE or JOIN set.
Ugh - I’ll see if I can reproduce this. So that grayed out merge check box, it will not stay unchecked, is that correct? Certainly it should not be able to merge curves at the position or tangency settings.
Previously, I could get it unchecked if I set both ends to continuous. But it was still joining the two segments event when checked and the box would be checked on the next Match command.
Somehow I appear to have gotten it unstuck. I’ll try to figure out what sequence gets it into that state and out of it.