First, what type of Computer you got? remember Mass Markings is a pack with a lot of big images at black and white, it would be a "whole sandwich" to process at once, if it crashes, it is possible that FeralHeart cant start because of the size of the file, and so on, crashes.
I recommend you to take off the Mass Markings and then log in, if it doesnt crashes, then, congrats, you found the problem.