Stats set to 0 at midnight gfor month view

I have changed my site to run 1.1 and am still not seeing any stats for the month on one site only. This is for the first site with siteid 1

The other sites all show the data as normal

If I choose week view it shows for the week and all daily data is there

All data is showing for Dec 2010


I am still trying to work out this problem, would it be a database problem? As it is only a fault on site id 1 not on any other site.