I'm new to Oblivion so I'm still getting my feet wet, but I had a weird problem with a sidequest today.
I tried several times to complete the Unfriendly Competition quest with Thoronir and Agarmir. After collecting the Macabre Manifest from Agarmir's house, I took it back to Thoronir - and he said he was sorry, horrified, blah blah...but that I needed more proof to catch Agirmar. So I tried following the quest map, but it just stayed marked on Thoronir. After reading several walkthroughs, I figured out that he was supposed to tell me where Agarmir's next gravedig was....except he hadn't. And no matter how many times I went back to him, with the Manifest, he never said. He just said he would not follow false accusations without proof.
Finally I got fed up and re-did the quest, and all went as it was supposed to this time. He told me where to find the tomb and thence Agirmir. Still...WTF? Can anyone comment on what might have gone wrong?
Thanks!