Trying to display one of the special characters ä and ö results in them being rendered as a square ("missing character"). It works with ü and Ä and ß, however.
It works fine on all other tested devices (iPad 2, iPad 3, Nexus 4, Nexus 5, Nexus 7, Nexus 10).

Trying to set a different font.family on the Text element such as Arial, setting none or setting it to Roboto don't help. Also textFormat has no effect. Font size and using pixelSize or pointSize have no effect either.