Yes I have this problem also, no bandwidth stats and all my clients stats (page=statistics) are all at zero
When you say the client stats are "all at zero", do you have any user agents, countries, or tracks reported on their respective tabs? Or is there just *nothing*?
If it's the latter (nothing at all showing up) then there's almost certainly something wrong with your cron job. In that case, please try running:
/usr/local/centovacast/bin/ccmanage processlogs all --debug
And see if it terminates with an error of some sort. The statistics definitely work fine on a few of our production machines I've checked with the latest build, so hopefully the above will yield something useful to help track down the problem.