So usually when you want to enter a fraction in Mathematica, you can do so by pressing "Ctrl+/". If you are on laptop with a german keyboard however, you will have to press "Ctrl+Shift+/" since you get a "/" by pressing Shift+7. This all used to work until recently it just gives me a strange spacing character, that when translated to FullForm, shows ".1f"
I am using Ubuntu 15.04 and it always worked till now, it works fine on other machines running Ubuntu and Debian with a german keyboard.
Any ideas? Changing the shortcuts should really be the last resort as I got really used to it and don't want to change it on every machine I'm using Mathematica on...