I'm having this strange error when I try to access the "member_view" template. Tried to disable all addons without any luck. The error seems to happen only with this specific template in both custom (Novus 1.2) and default styles.
406 errors like that are almost definitely from mod_security or some server-limiting thing like that. In general, you'll want to contact your host to figure out what rule is triggering it.
Well, if it's the same issue then it honestly hasn't effected anything for me. it just doesn't show the included templates as tabs. I can still save an edit and all the other stuff.