Strange problem, with once working model

[Bloody_Turds]

http://www.hiveworkshop.com/forums/models-530/team-colored-hotel-104206/?prev=u%3DBloody_Turds
I know its not him, because i had the same problem, ive looked around the model for about half an hour, and i cant find any reason that its doing what its doing..
I would apreciate if someone took a look at it..
Thanks