I have a site that's not working in IE11. I get the _doPostBack error.
I fixed this for IE10 but running a patch from Microsoft.
Now, I'm getting it in IE11:
"This whole concept has been long-fixed in ASP.NET 4.5. If you have a .NET 4 app you put .NET 4.5 on it and you're set. We don't sniff like this anymore"
That means install framework 4.5? (I just noticed that fix is for Windows 8.1. I probably have to look for another solution or upgrade my code to 4.5)