I GM a Dresden Files campaign, and I have a first time role-player that has become a problem in terms of advancement of the story. At first I chalked it up to inexperience, but its become more and more pronounced, to the point that tonight he took up half of the time with an inconsequential inter-party conflict, then after he was rendered unconscious, left.
The players and I are becoming more frustrated with his antics as we have a very short time weekly to play, and much of that time is taken up by this player. I've tried to talk to him both in-game and out-of-game (and other players have also) and though he appears to be understanding and receptive of the talks, it continues to be a problem, and in many cases, his retort is that this is important to his character, so we continue to work through this week after week, and I have to end the session in exposition rather than a gradual discovery/uncovering so that we can make progress.
I'm attempting not to exclude him from the game, but short of that is there something that as a game master I can do to enforce direction and advancement of plot?
NOTE: I was trying to make the question a bit generic, but to give a bit more insight about one of the situations: he was using the sight to assess the scene, and after he was finished with his assessment, he attempted to look at each of the players in turn. As they'd seen him use the sight before, he was able to get a good look at one of the characters before they figured out what he was doing, and one of the other players took exception to the intrusion on their privacy IC.
The situation escalated and became physical. In other cases where there's been inter-party conflict, they've played the combat a bit, then the person on the losing end concedes and they tell the story from that perspective. But he wouldn't concede. The other players used this as a cover as it happened to be a distraction, but as he's the only full wizard, when the combat started, they were a bit hobbled by the loss of their spell power going against a wizard.
So it's not enforcement of a particular plot. If he was going in a different direction with the plot, I've done that before with this group, even to the point of improvising scenes when they do stuff I haven't planned. It's the movement with any plot.