We are glad to hear you got it sorted out. It sounds like you may have had some weird/old missions saved or something and it wasn't converting them properly. It should have been fine coming from 4.1.2 though.
The startup splash screen should be the same as before, just with the updated number. Not sure what is going on there but we have seen cases where the Maps Made Easy logo does not display properly after deleting and reinstalling. Usually doing it again fixes the issue.