Yep, it looks like you’ve got a problem with FP license. Could you, please, check if you’ve got it activated?
In this case you won’t have FilmPack entry here:
and FP version and license is displayed in the splash screen.
In most cases if you have FP installed and activated (I can judge about it by your statement about PL2) it’s automatically acquired by PL3 but probably you faced an improper installation behavior.
You can try to uninstall and reinstall PL3.
So, please, double check and let me know your result.