3 issues here. I'm having to consult walkthroughs because some things aren't quite right and I don't remember if they are supposed to be that way or if the game is bugged. On the first fighters guild quest to extermate some rats, Drarayne Thelas's door is locked.. I cant talk to her about the quest. What gives with the locked door?
The walkthrough says nothing about a locked door. It does mention a bug in the quest that makes it impossible to complete another guest. This is fixed by the Morrowind Patch Project. Does Morroblivion employ these bug fixes for it's game or are all those bugs still in the game?
Lastly, it seems many of the map markers are really messed up. For instance on a quest to check out the door that appeared oin Niben Bay the marker for it is next to Balmora near a shrine.. not near any bay at all. If you look at the map, and point in the direction of the marker, it doesn't line up with where the marker is on your mini compas.
I'm using the standard map that came with the game.. I know there are other better maps.. would one of these make a difference? Is there another way to fix this issue? I have no idea where Niben Bay is and can't find it on the map to find this door. I followed this marker and wound up having to fight some tough ( for a beginner character) dredric dudes in the shrine. Missing quest markers by design i can understand but i think this is an error of some sort.
Oh yeah.. another issue I forgot about. Items turning into stolen items on a whim. I had some iron armor got from looting bandits in a cave. Sold some to the pawnbroker at Seyda Neen but when I got to Balmora and looked at my inventory, they all had red hands. As well as the tax report I found on the dead tax collectors body. I KNOW that wasn't a stolen item before.

Well Drarayne Thelas' door
Well Drarayne Thelas' door will only be unlocked at certain times, wait for an hour then try and repeat until you get the right time, i can't remember the exact times for it though. The map isn't perfect, because the source for the map was a scan and thus it is as good as it's going to get and map markers will only point you in the general direction not to an exact point like in Cyrodiil. Now the stolen item thing i can't vouch for because it's never happened to me.