Mirror mode is not 100% stable, the client is very complex, you can expect weird bugs from time to time, but the devs are working on it.
You can't see if it loaded fine or not, sometimes it skips caching inventory or some widgets, so it can't access the inventory, that could explain your venerate issue before.
Same for the walking thing, Webwalker issue (Camera rotation) which the dev are looking into atm.
So should be fixed asap aswell!
For Death walk I will have to take a look,