Yup, it's still working (just checked depth.ltcbtc), but the order book it gives is still wrong.

Edit: to clarify
I first take a snapshot of the order book via the regular api, then modify it as changes come through the websocket.
Most of the websocket events are correct - but it seems to be missing either the order change or cancel events, so over time an error builds up. As it is it's unusable.
(although it's completely possible that I'm just doing something stupid and it's fully functional!)