perhaps the fu16 install killed it.
when i installed fu10 [prior to it being called fu16] it destroyed my fu9 installation [thanks, BMD, for the warning on that BTW]
which meant ALL my presents and fuses, macros and every setting and plugin went away - including my impossible to retrieve keylight for fusion plugin
when it came time to put it onto my laptop [due to my fusion dongle suddenly not functioning on my desktop] i had learned by then [a little late but at least i learned it] that i needed to rename my fgu9 install folder to something different so the fu16 install would not kill it.
so perhaps it has something to do with that.
i don't know if there is a trick to re-install fu 9 on a machine that already has fu16 on it, if there is i might be willing to try but only if the instructions are downright idiot-proof