I picked a castle where I could get good distance and snipe, had put everyhting into xbow and had archer faction, retreat, rinse, repeat...timed it right with the enemy reinforcements, etc. I wanted to get on with seeing the new features.
Anyway, I do play with your debug on and all messages so i can see whats going on, after I took castle i would sit for a few days in town (they took castle back), then wander around, sit for a while, visit places, etc. When I reinstall and try again, I will get screenies or a save file for you if i encounter the same wierdness.