I can't seem to find anything about this from google... so wondering if there's something I am doing wrong. Got iPhone 4S with iOS5. I have the twitter app installed already and am logged in to that. When I go to iPhone Settings > Twitter is shows the app as INSTALLED. But... when I enter my @username and password, it ALWAYS says "Error signing in - the username or password is incorrect". I know they are correct as I have just deleted and reinstalled the twitter app and logged in with the details!! any ideas?!