I am trying to use the UserDB package for authroization via ODBC, however the management screen won't let me delete the top level acl_users folder. You can't!

I had the same problem. What I had to do is: - create the Roles in the toplevel folder, - create the users database connection in the top level folder - create a UserDB in *all* subfolders of the top level folder, that use the toplevel database. - and put only anonymous stuff in the top level folder. If someone has a better approach, I am interested.