SQL Server 2008 Reporting Services client rendering error: Object reference not set to an instance of an object.

I have just installed Windows Server 2008, SQL Server 2008 and VisualStudio Team Suite 2008, applied all updates, including hot fix KB956717.  When I try to render any Reporting Services report via the /ReportServer URL or via the preview in the Business Intelligence/Visual Studio, I get:
"An error occurred during client rendering. Object reference not set to an instance of an object."
When I try to run a report via the /Reports (Report Manager) URL, I get:
"An error occurred during client rendering.
An error has occurred during report processing.
Could not load file or assembly 'Microsoft.ReportingServices.Modeling, Version=10.0.0.0, Culture=neutral, PublicKeyToken=xxxxxxxxxxxxxxxx' or one of its dependencies. Access is denied."
MAGLOCLENAsked:
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richard_cristConnect With a Mentor Commented:
This is an educated guess on my part based on my experience with .NET and Windows development, which is not extensive.  It sounds like you have a directory or file permissions problem where you do not have access to the directory or files (I'll take the slap for obviousness now to get it out of the way).  What login or user account did you use to install the software and what login or user account are you using to run the reports?  When using the URL I would suppose that the IIS web server "username" is doing the work.  This may be the same case in the Visual Studio environment if it is also using the URL access method by default.  I would check permissions of the directories and/or files where the assemblies are stored and see if any obvious permissions settings conflicts show up with regards to whatever username is running the reports, whether it be your username or an IIS login account.

A Windows expert may be able to answer this just by seeing the error you mention above.
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MAGLOCLENAuthor Commented:
I already suspected a security problem and fixed it by reinstalling everything again from scratch, being careful not to change the accounts used for anything, once I specified them during the installation process.
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MAGLOCLENAuthor Commented:
By the way, Reporting Services 2008 uses its own limited web server, not IIS, which was used for Reporting Services 2005.  This has caused a number of related problems, other than the one I posted, that Microsoft needs to fix.
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MAGLOCLENAuthor Commented:
See the comments I added to the problem.
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