(Not sure which section I should have posted this, I am sorry if I made a mistake).
Everything is in the title.
It happens almost every time in 4.15 and 4.16, but not in previous versions of the engine: works wonders in 4.13.
Opening anything animation related freezes my computer, including animation blueprints. I have no problems in normal blueprints.
Currently, I use multiple versions of the engine to cope with it, but I am not sure of what to do to really solve this.