So long story short, I had to use the "restore default settings" function on the PS3 in order to get it to not lock up today. After doing so, I noticed the asterisk next to my "Profile" name, and then proceeded to try and play Injustice. I got errors basically saying that because it is not on the original profile (even though it is) it cannot save, use DLC, or get trophies. In looking into this a bit afterwards this seems to be a problem with this function, but I can't seem to find a solution.
I'm probably going to try and contact Sony, but figured I check here and see if anybody knows what's up and if there's anything I can do.