Web Analytics reports and not showing data

Recently we are not seeing Web Analytics data on our sites in our SharePoint 2010 farm. Before we used to see the data. This is what we are seeing now "There is no data available for this report. Here are some possible
reasons: (1) Web Analytics has not been enabled long enough to generate data;
(2) There is insufficient data to generate this report; (3) Data logging
required for this report might not be enabled; (4) Data aggregation might not be
enabled at the level required for this report."

I checked the Web Analytics Service Application and it is started. Web Analytics Data Processing service is started on all servers.Microsoft SharePoint Foundation Usage Data Import Timer job is running every 30 minutes, while Microsoft SharePoint Foundation Usage Data Processing job is disabled. Does this job has to be enabled for the web analytics data to be reported? Are there any other places to check to debug the problem? Appreciate any help.

rani