No per-process CPU usage in TOP or other tools

Hello All

     When I run TOP, all processes report 0.0 cpu usage. I look in /proc/[pid]/stat and I also see 0.0 cpu usage for all processes. However I can get overall cpu usage from most tools. I had this problem before and it fixed itself when I rebooted. However I had to reboot for an update and it seems it will not fix itself after a reboot. Do people have any idea why the per-process cpu usage is not being reported? What can I do to fix it? It is not critical, but it is nice to see these stats.