Feral Heart

I have been having lagging problems with my game. I have downloaded the pawsome items pack and, the legendary presets. Whenever I login and play the real game, it always say feralheart isnt working. Usually when I turn angels and my character's head moves, It stops for like 3 minutes and then my screen turns grey and it has something telling me, feralheart is not working. I have researched and tried to find the answer to my problem, but I havent found it yet. I have notified my friends on the subject aswell, they claimed to not know.