There are two separate issues at work here. One, in the case of mediabrat's and negusm 's accounts, is that there was a technical glitch that Support fixed.
The second, broader issue for all clients is that stats are not enabled by default. You need to login to cPanel and enable AWstats for your domain. Once that has been done, it will take at least 24 hours for new stats to be created, although you may be able to use the "update now" link in cPanel to see stats sooner.
I am not WHB staff and I am not paid.
I provide help in these forums on my own time.