Well, this post solved one problem I've been having with a DNN 5 upgrade: http://www.dotnetnuke.com/Community/Forums/tabid/795/forumid/33/threadid/126628/scope/posts/Default.aspx. Was getting: "Private Shared objProvider As DataProvider = Nothing" as part of an error. Removing the DLLs seemed to have done the trick ... at least the site loads now!