Matthias Wessendorf I just tried to reproduce your issue and the keyboard is showing up here:

https://www.dropbox.com/s/sn6edwmklytg0b2/Screenshot_2015-02-04-19-14-20.png?dl=0

https://www.dropbox.com/s/dzgflcd8avxtko8/Screenshot_2015-02-04-19-15-13.png?dl=0