WebReport, does not render data sporadically

edited 7:07PM in FastReport .NET
Hello,

we have an issue, that FastReport.WebReport does not render the DataArea on a customer IIS 8 production server
sparadically. Sometimes it shows only the HeaderBar. ( The FastReport.Export.axd 'output' also only contains the header. )
We use a MatrixObject control in the report, the data is provided with a DataSet.

Has anybody an idea what causes this behaviour ?

Products :
FRNet_team2014_2_Web2010.exe, ASP.NET MVC 4, Microsoft .NET Framework-Version:4.0.30319; ASP.NET-Version:4.0.30319.18446
IIS 8

Many thanks.
Best Regards
Thomas

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