Hi . You might accidentally close some windows in operation then you can't see them...
Easy to revovery. Select' Standard view' in the 'model' tab. then everything backs to inital ones.
Well if you click "Z" again and it still does not enable the "add" button (right poiting arrow) than it simply looks like a weird bug.
Did closing and reopening solve it...?
It does not look like any bug I've seen before.
I know it's a weird thing .
The idea is that this problem I had with Process Simulate 14.1.2.
Right now I'm using 14.1 version because of project requirements.
I'll keep in mind what you said.