Anyone ran into this yet? Happened after parted ways with him once (after taking Frea on as follower).
He just walks around in permanent slow blocking stance with whatever weapon/shield/armor combination he has on.

Will not cast spells or anything.

Possible fixes?

Attempted shouting him, punching & reload, full unequip/reequip etc.

I had the same thing happens to me, I tried everything including the whole reset followers lvl trick using the wabbajak, nothing worked.

What happens when a bunch a enemies attack him (maybe go find some rieklings or reavers to test). Does he just try to block in the one direction?

What happens is, if you draw your weapon(or spells) he just walks around trying to block. As far as I'm aware, he doesn't actually block. He will still attack targets within range, then return to blocking.

It is a GLITCH/BUG based on the coding, if you get in close enough, or watch when hes attacking, you can SEE the spell in his left hand. Then he will just return to his blocking stance.
WTB patch.

How about with sneak on vs off, any difference?

Also, if you dismiss is he still ilke that in the tavern?

As long as your weapon isn't drawn/nothing is aggressive towards you, he's fine. Whenever he pulls out his weapon, he jumps into the block stance and wont leave it.

I have attempted to this point, almost everything to fix it. I took all perks on pickpocketting, stolen everything he owns, reverse pickpocketed new gear onto him and then wabbajacked. Didn't work. He still attempts to 'blockwalk' everywhere with the effect of a spell in his left hand. Even attempted to put a shield in his left hand and attack to force him to actually block. Didn't work either.

This is definitely a bug that will require a patch, shame seeing as how hes one of the better followers now in the game.

Even when he only has a bow he somehow discovered a way to block with it, he actually holds it out in front of him horizontally while walking around as if he got stuck halfway through the bow punch animation. It makes him essentially useless as a follower since he now moves really slow blocking whenever he has his weapon out and won't cast spells. Real shame considering he quickly became one of my favorite followers.

Here's to Telvyn Saro! The only NPC to be able to 'bow block' since Oblivion!

FYI Gstaff posted this for a different issue, but it maybe worth trying to reset Teldryn?

http://www.gamesas.com/topic/1428133-main-quest-breaking-bug/page__pid__21928660#entry21928660

Note: To do this, it should be tried with Teldryn Sero first being dismissed (not your follower) and left inside the Retching Netch.