Hello, I'm Klaus, the representative of twitbird team, I'm so sorry for the crash problem in recent updates. Please let me explain why it crash and how you can fix it.
The reason why twitbird crash on your device, is data migration. Apple provides a mechanism called Core Data that stores your data in the app. When the data structure change, there should be a data migration to move old data structure to the new one. Unfortunately, we did a bad job in twitbird v2.3, many users of twitbird encountered a crash when update from v2.2.1 or v2.2 to v2.3 and following versions like v2.4 and v2.4.1.
To fix the crash is simple, just delete the twitbird app, restart your device, and re-download twitbird. Re-download twitbird is free of charge with your same iTunes Account, re-buy global push is also free of charge with your same iTunes Account AND same twitter username.
We apologize for the crash event on twitbird, sorry. Please delete and re-download twitbird to your device if it still crashes after an update. Sorry.