Crystal Report XI R2 cause IIS to hang while calling ReportDocument.Close()

Dear Concern,
We are using Visual Studio 2008 (.Net framework 3.5) to develop ERP Web portal for our company. Crystal Report XI R2 has been used here for generating customized report.
I have written a CrystalReport utility to do all type of logon, parameter pass stuffs with the report. The utility itself implements IDisposable and following is my code at the Dispose method:
public override void Dispose()
_crReportDocument.Close();
_crReportDocument.Dispose();
But when my code reaches _crReportDocument.Close() then the IIS/ W3C hangs. I have waited for long time to the process to be finished but it never.
I also tried to move the code from my utility and directly close the report object from caller form but failed.
Can anyone please give me any suggestions regarding this issue? Is there anything wrong with this?
N.B. I have succeeded with Crystal Report X by using the same procedure.
Thank You.

Dear Adam,
Thanks.
The problem resolved after I have installed CR XI R2 Service Pack 4. Crystal Report 2008 of course is a better solution but I have to wait a bit for procurement.
Warm Regards,
Sultan

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Crystal Report XI R2 cause IIS to hang while calling ReportDocument.Close()

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