When a user requests membership to a project, the "request membership" button should no longer be visible to the user. This will be a little difficult to manage, but it does sound like it'll look a bit more polished if I do. I'll give this some thought. FIXED: Now the "request membership" button is DISABLED as long as the request is pending. As soon as the Project Manager selects "accept" or "decline" from the message he receives, the message is no longer "pending" and the submitter will either become a member of that project or else be able to use the "request membership" button again. The only way to permanently block a submitter is to keep it pending indefinately.