Unhandled exception while editing cell + minor issues

Hello,

Sorry, but I don’t remember exactly. It all happened so fast…
What I remember is that I modified a chemoreceptor I had just placed down. I don’t remember what I did after, could have been OK, could have been Cancel, could have even clicked outside of the window. After that I remember placing something else down - and crash.
I’ll test it now since I have an autosave just before the editing.