PDF generation randomly stops site wide

[Jeff]

We are using Telerik Reporting to generate pdfs on our site.  Everything works as expected for days at a time, then suddenly stops working for all users. When we restart the app pool it starts working again. We are using Q2 2013 SP1 of Telerik Reporting. Any suggestions? (other than upgrading unless you know that this issue was addressed in an update) Here is the error stack:

System.IndexOutOfRangeException: Index was outside the bounds of the array.
   at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
   at Telerik.Reporting.Processing.ItemFactory.ResolveRuntimeItemType(Type t)
   at Telerik.Reporting.Processing.ItemFactory.Create(Object itemDef)
   at Telerik.Reporting.Processing.ReportProcessor.ProcessReport(ReportSource reportSource, IRenderingContext processingContext)
   at Telerik.Reporting.Processing.ReportProcessor.ProcessReport(ReportSource reportSource, Hashtable deviceInfo, IRenderingContext processingContext)
   at Telerik.Reporting.Processing.ReportProcessor.ProcessAndRender(String format, ReportSource reportSource, Hashtable deviceInfo, IRenderingContext renderingContext, CreateStream createStreamCallback)
   at Telerik.Reporting.Processing.ReportProcessor.ProcessAndRenderStateless(String format, ReportSource reportSource, Hashtable deviceInfo, IRenderingContext renderingContext, CreateStream createStreamCallback)
   at Telerik.Reporting.Processing.ReportProcessor.RenderReport(String format, ReportSource reportSource, Hashtable deviceInfo)

[Stef]

Hi Jeff,

This is not a known error to my knowledge.

Please check if the error occurs with a specific report, set of data records or amount of data. In order to investigate the problem, please open a support ticket and send us a runnable demo project that reproduces the problem

Regards,
Stef
Telerik