I just completed the first quest of the bard college where I retrieve the lost verse of King Olaf from Dead Man's Respite. I brought it back, gave it to Viarmo and he read it to the Jarl, and then I talked to Jorn to start the festival after 8pm. Everyone went outside to the effigy of King Olaf and Viarmo started to light it. However he hasn't stopped lighting it. He just lights it, turns and lights it again, forever. I tried to stand exactly where the quest arrow points to, tried to talk to him, tried to talk to others there, tried lighting the effigy (nothing to click), tried lighting it with firebolt... tried to shoot him and return to the scene after paying my fine. He's now hammering the effigy...
I guess I am going to just use the cheat on this page to finish the quest http://www.uesp.net/wiki/Skyrim:Tending_the_Flames, but I don't like using cheats and I don't know if this will nullify any achievements on Steam. Did I mess up the quest by missing something or is this a random bug?