From my point of view, this is not a noob question. Anyone who can answer this fully has mastered the dark arts of Ignition. I’ve researched and asked related questions in the past and still don’t understand.
I’m jumping on this thread to say I’m still hoping to learn more in this area, and so I get notified of any replies.
(EDIT: To answer your simplest surface question, I’ve found I get the best behavior if I never import any of my own custom script libraries, and only import system when working in the scripting console. Which sometimes requires editing my script files to have import system while working in designer, but then not saving the change…)