__dopostback undefined in IE 11 on windows preview 8.1

Question

I have an ASP.net 4.0 application running on Windows Server 2003.

I am running Windows 8.1 preview with IE 11 and I am getting the

Answer 1

We are currently using asp.net 4.0 and had this issue for a while. It first appeared with IPad users, and we solved it by creating a IPad.browser file. Then this bug appeared for IE11 users. We installed the KBs above with no luck. The solution: delete all *.browser files (and even the App_Browsers folder itself). Now it works!