I have an odd problem where FSM components come up with "blank" file icons in the Inspector (Unity 5.6.4p2, PM 1.8.5.f8):
The component on top is newer, so I think something happened after an upgrade (I believe I was still in 1.8.x before this happened).
It only happens in this project; new ones display fine. One clue may be that reinstalling PlayMaker did not fix it, but overwrote/erased the icons from *all* the FSM components. (For the record, it's only the Inspector, and the icons in all other tabs appear fine.)
I don't think it's just a Unity bug, since PlayMaker is the only plugin I experienced this with, so I thought I'd try here first. Any ideas, let me know.