Seems one of the latest aditions is causing World of Warcraft to hang.

Tested on WoW-64, ABA, Ampere and Bugsack as the only addon loaded, Lvl70 Shaman. Problem exhibited both in my current fork and latest alpha, my guess would be a loop that's not ending properly.

Only on Shaman?

Hangs there too. I think committed something I have not tested :-)