I'm pretty sure the early version used a slightly modified sassy.
I forgot what the problem was, it was a few months ago.
If it was a modification, then it was a heavy one. The only things that looked like it was some algorithms and names, but hey, some algorithms has to be done, and names aren't forbidden to use.
And if you don't remember the problems, then they weren't that big. Humans remember more failure than success.