I released Whalebird 2.8.0. In previous version, Whalebird delivers notifications for a account you have open. In this versio, Whalebird delivers notifications for all accounts you logged in.
But when you open preferences or Whalebird is closed in the tray, you can not get notifications. I will improve this part in the next release.

https://github.com/h3poteto/whalebird-desktop/releases/tag/2.8.0
#whalebird