I’m really not sure if a plugin has mandated the _wpnonce string or what the deal is… Is it something that BuddyPress adds for security? I have seen it on other links, and works fine for different functions like send public message, etc where the _wpnonce is also used.
Note: I am only experiencing my problem with not being able to add a friend from a user’s member page. It works fine on the Members List page.