Oh well, I'm having this issue in all of the 4x versions of Pitbull:
Once I installed the addon, the only Layout I can load is ABF (the others are not even shown). In the 3x Versions I was able to load all basic Layouts.
I have no idea, why I am unable to load other Layouts. I guess the sollution is pretty simple, but I seem to be too stupid. Sadly, the earch function didn't help me.
On a sidenote: I'm using the german client... maybe that's what's causing the Problem?
Thanks for your help in advance. I hope that's a known bug.