Warning: Contains quest spoilers.
I'm currently doing the High Isle quests and encountered a minor bug at Steadfast Manor.
I was working on two quests simultaneously, if that's relevant-- The Large Delegate and An Experiment with Peace.
I had collected a Mammoth Ear Leaf, freed Mender Roslenn and Seraphyne, and returned to Steadfast Manor to administer the leaf juice to Tanillin and confront Master Healer Viralaine. I decided to administer the leaf juice before confronting Master Healer Viralaine, if that's relevant.
After administering the leaf juice and speaking with Tanillin, I turned to leave the room and go confront Master Healer Viralaine, but Rigurt the Brash was standing in the doorway blocking the way. I talked to him, and tried to squeeze past or jump over him, but it was impossible to get by him and I was trapped inside the room.
I finally teleported to Highhallow Hold in Gonfalon Bay and took the Gonfalon Square Wayshrine back to the Steadfast Manor Wayshrine. I deliberately avoided going to the Ancient Anchor Inn yet because I wanted to see if Rigurt the Brash was still blocking the doorway, and he was-- I couldn't get by him to go back into the room to talk to Tanillin again (not that I needed to).
I was then able to complete An Experiment with Peace.
I've fought mudcrabs more fearsome than me!