Sometimes all the global variables referenced in actions in an FSM are removed and are all "none" and I have to manually reselect them all. It seems to happen in both templates and prefabs and it has happened in multiple projects and since I began using playmaker (2 years ago). The only pattern I've found is that it can happen if there is a console error caused by that FSM or if I open a template while in play mode.
I don't know if there's anything that can be done to fix it or even reproduce it since it happens sporadically but I just wanted to report it.
Thanks!