>Oh, I see what you mean. See:
>http://blogs.msdn.com/b/webdev/archive/2012/11/19/all-about-httpruntime-targetframework.aspx
>
>Snip:" If the targetFramework attribute is not present, we assume a default value of "4.0" and run the application in quirks mode."
>So, seems to me that the only way to ensure the 'latest' version is used is to specify the targetFramework in the config file.

Very good, thanks