Sharepoint web analytics does not show any data

Question

Hello,
We installed Sharepoint Web Analytics some days ago (separated application pool).
Installation completed successfully.
Search works fine and returns expected results.
But reports still don't show any data :
Data Last Updated: 15.08.2014 02:00:16 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.
What I tried :
connect to website using different users (admin user included)
checked that needed services on server are started (especially analytics services)
restart services Web Analytics Data Processing Service and
Web Analytics Web Service
checked that all services applications are started (WSS_UsageApplication status was
stopped so I started it using Sharepoint 2010 Management Shell)
checked service application associations (especially if Analytics Service Application Proxy is checked)
manual execution of jobs (Web Analytics Trigger Workflows Timer Job, Microsoft SharePoint Foundation Usage Data Import, Microsoft SharePoint Foundation Usage Data Processing)
manual start of incremental crawling
restart IIS
checked scope of data logging (especially if Enable usage data collection and
Enable health data collection are checked)
checked that the .usage file are generated correctly on the disk
checked in the Logging database (WSS_UsageApplication) that the
RequestUsage view contains data collected from the .usage files
checked that data is successfully extracted from the logging database into the staging database (LastLoggingExtractionTime)
checked that data was successfully copied from the staging database to the reporting database (LastDataCopyTime)
checked on the website side that Advanced Web Analytics feature is
Active
recreate web analytics application
checked for any message in ULS logs that could help... I only noticed that error :
The SharePoint Health Analyzer detected an error.  Drives are running out of free space.  Available drive space is less than twice the value of physical memory. Can it cause the problem ?
All appears to work fine but I can't see any data in the reports.
The thing is that Inventory data is collected successfully and I can see the related reports. Traffic and Search data are still empty.
Anything else I can try ?
Thanks.

Answer 1

Yes I have granted application pool identity full control on the Web Analytics Service Application.
I also checked that Sharepoint 2010 timer service is started.
I can't see anything in the logs that could help, when accessing the reports. The only thing I noticed is this kind of log which occurs
regularly and seems to be an exception :
Enumerating all sites in SPWebApplication Name=SharePoint - 80.
Site Enumeration Stack:
at Microsoft.SharePoint.Administration.SPSiteCollection.get_Count()
at Microsoft.SharePoint.Taxonomy.UpdateHiddenListJobDefinition.Execute(Guid targetInstanceId)
at Microsoft.SharePoint.Administration.SPTimerJobInvokeInternal.Invoke(SPJobDefinition jd, Guid targetInstanceId, Boolean isTimerService, Int32& result)
at Microsoft.SharePoint.Administration.SPTimerJobInvoke.Invoke(TimerJobExecuteData& data, Int32& result)
Maybe it can be the cause ?
I have also cleaned the drive where .usage file are generated so the error "Drives are running out of free space.  Available drive space is less than twice the value of physical memory." does not appear anymore.