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I recently upgraded a .NET 2.0 app to .NET 4 and everything works great.
When I setup IIS I selected .NET 2.0 under the ASP.NET tab in IIS 6.
The app runs fine but I get these intermittent ViewState errors.
Could the IIS setup be causing the ViewState issues?
Probably because view state in .Net 4 uses a different algorithm than earlier
ASP.NET 4 Breaking Changes
You need to register .Net Framework 4.0 in IIS, then run your site under Application pool for .Net 4.0