[there]

If you logged out of the application, it should unregister. It should only re-register when you log back in (which would require communication with Twitter's servers, which would update the APNS token to point to the correct account). This is how I handle APNS tokens in my Pushover app.

[seppo0010]

I think you are missing the point. It is a multi-user app. The first user didn't logout when the second login, both were logged in at the same time.

The _real_ solution is to wait for server acknowledge to delete the account from the phone.