after migrating from mvc2 - mvc3 with minor issues ... I encounter the following problem when calling Membership.GetAllUsers
it seems that instead of System.Web.Secu
In ASP.NET MVC 3 Beta there was a bug where some additional features were enabled by mistake. There are some config settings to disable them, but they shouldn't be needed anymore.
In ASP.NET MVC 3 RC (which was released earlier this week) they should all be fixed. You'll want to make sure that in your web.config files and project references you are not referencing any of the "WebMatrix" DLLs.