Access Ports stats on 2.5

One of my customers is running MSP 2.5 and currently has approximately 10 stores up and running with WS5100s and 12 MC9060s in each store. However, when you look at the AP stats on MSP every AP shows 0 MU associations and all of the Network performance stats are also 0. As we are only collecting the data once every 15 minutes it is conceivable that when data is collected an AP doesn't have any MUs, however, I graphed some APs over the last month and they have never had any associations!! Am I missing something or is there a bug with this on 2.5?