I started experiencing this issue a few hours ago after being spammed with lua errors in-game with no addons enabled. I conducted a scan/repair thinking that might help but fell into the infinite loop instead. I’ve tried all fixes listed here plus a few others the CoD community came up with when facing the same problem. So far nothing has worked (including the previous post’s fix of disabling Malwarebytes).
This is happening for both live and classic, though not any other Blizzard game so far. I was able to update Hearthstone without any issues.