BUG: The Submit button on ASP.NET pages does not work after you install the .NET Framework 1.1 Service Pack 1

SYMPTOMS
After you install the Microsoft .NET Framework Service Pack 1 (SP1), the Submit button on Microsoft ASP.NET pages may not work. You do not receive any error messages.
CAUSE
This problem occurs because client-side script files that are in the Web site are not synchronized with the .NET Framework 1.1. The PostBack event on client-side validation is stopped.

http://support.microsoft.com/kb/889877

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