Logos 3.4.0 has some serious issues running properly on iOS7 so we've just submitted Logos 3.4.1 to the app store. Logos 3.4.1 includes fixes that allow it to run as expected on iOS7. Feature wise it is identical to Logos 3.4.0.
In short, Logos 3.4.1 = Logos 3.4.0 + iOS7 fixes
