Hi!
There's been a change in the behavior of .NET controls hosted inside Internet Explorer after installing .NET 4.5 RTM:
Prior to to installing .NET 4.5 , the .NET control (.NET Framework 2.0) was downloaded from the server, the CAS policy was checked and the control (embedded using an object tag with the server-path as the ClassID) executed. This continued to work in .NET
4.5 RC but broke once .NET 4.5 RTM was installed.
See also here: http://stackoverflow.com/questions/12109642/loading-net-usercontrols-in-ie-with-net-4-5
There is information about .NET 4.5 compatibility posted here: http://msdn.microsoft.com/en-us/library/hh367887.aspx (under Web Applications). It recommends using a registry key to re-enable the previous behavior. Unfortunately, the registry key does not
have an effect. Is the documentation incomplete or is this a different issue?