If you ever get into the situation where you've set up Roles, Users etc. on a machine and then script the database over to another machine, and suddenly the users can't login or aren't in the roles they should be - make sure you have specified the applicationName property in BOTH the membershipProvider and roleProvider sections in the web.config.

http://weblogs.asp.net/scottgu/archive/2006/04/22/Always-set-the-_2200_applicationName_2200_-property-when-configuring-ASP.NET-2.0-Membership-and-other-Providers.aspx