Sometimes we get a little hurried when using the cloth room and forget to take the fundimental steps each time.  On the figure and prop you need to make sure you check the boxes each time in the properties of the figure and prop to "colide against" before you take the items into the cloth room as these adjustments are not ususally available in the cloth room.  You leave any of these unchecked and your prop will not work well with the figure.  Also you may have to put a constrained group on the prop so that a certain portion will not move.