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JavaScript runtime error: 'WebForm_DoPostBackWithOptions' is undefined

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Hi, I am using VS2010 and Windows 7. ASP 4.  I am testing an application that has been running for 7 years.  I usually add modifications that I test every month. Now when I enter test mode in VS2010 and display the first screen and then hit the first button I receive "JavaScript runtime error: 'WebForm_DoPostBackWithOptions' is undefined". This is a first. I have been racking my brain to remember what I have installed or upgraded in the last month. I believe I may have updated  IE to 11 but I am not sure. Can anyone lead me to the correct direction? Thanks, Jim 

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