The symptoms you are showing in your screenshots is a common incompatibility. Either the app is not 4.3.1 ready yet, OR it is designed for iPhone only, not iPad.
I believe it happens because of a clash of names in some library or other that was updated on iPad back in 4.2.1. I could be wrong, but I'm sure I read that somewhere from the developer of Notified Pro.
You will just need to keep an eye on the developers and see when they update them.