*An error has occurred: Specified cast is not valid.*  - Infoview Error

Has anyone encountered this error when logging into Infoview or Report Datasources? 
I've uninstalled and reinstalled Crystal Reports Server several times and have installed the Service pack1. I'm still getting the same error. I'm using Business Objects 11.
Any suggestion is appreciated.  Thanks!
URL:
[<server>/businessobjects/enterprise11/InfoView/logon.aspx]

I too am having this issue.  I have followed the support note (1205427) and re-installed .NET Web Component Adapter but the issue is still occurring.
I am running release 1 of Crystal Reports Server XI Version 11.0.0.12825

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