Made folder in D: FZ test placed file SingleSideSpeedy3.3 Everything Ver2-6.fzz inside.
File/Open, and it's fine and with search.
Change folder to D(D) - Projects(D) - Electronics(D) - PCB Projects(0) - Nordl3Nordl3 - Dual LM Four Quadrant Multiplier
Reboot. Quick start missing so File/Open, and it's fine and with search.
Change folder to (D) - Projects(D) - Electronics(D) - PCB Projects(0) - Nordl3Nordl3 - Dual LM Four Quadrant Multiplier
Change file to D(D) - Projects(D) - Electronics(D) - PCB Projects(0) - Nordl3Nordl3 - Dual LM Four Quadrant Multiplier
Reboot. Quick start missing so File/Open, and it's fine and with search.
Once it's missing from the quick start it's always a full manual direct, so it can't really go wrong.
The name change doesn't look like the problem, as I remember changing stuff internally and it always tells you something is missing, so I would say something else damaged it. FZ sometimes doesn't refresh during a session so maybe it got damaged, and only the reboot made it appear.
EDIT
Can't tell you much more than what the other guys said. File won't open, and that means it can't crash FZ.
Does it have a part with movable elements, and are any of the above posted parts one of those.