I talked to Arkov about this last night, and I -was- able to reproduce it again once. So it's not that uncommon. I just can't reproduce the bug reliably.
To Arkov: Wierd pathing bug
What bug?
Arkov may know what you are talking about, but the rest of us don't.
On that note: NWN's pathfinding sucks. You are better off walking by control, particularly if it is someplace tight or difficult to get to.
I do know what he's talking about. Track me down in IRC and show me in-game at some point.