I've been having some strange issues with following new people-- I'm issuing the createFriendship call as always, Twitter doesn't appear to be returning any error or other result code, but then when I manually check on my account, we're not following the new person. I didn't see anything specific in the Twitter status blog-- could it be some kind of known API issue?
Sorry I don't have more specifics right now, I can work on providing a sample case if you want. best Eric