There is an Interposer update that's finally available at [1]. This update fixes a problem where out and ref parameters weren't propogated out of the Interposer properly.
[1] <http://www.gotdotnet.com/userarea/filedetails.aspx?FileName=Interposer.zip> You can read messages from the Advanced DOTNET archive, unsubscribe from Advanced DOTNET, or subscribe to other DevelopMentor lists at http://discuss.develop.com.