Comment 3 for bug 784864

Luckily popper.cfg was stored in trash and sent to us by jokergermany. We found out, that the user-configuration was broken. That was why deleting ~/.popper folder solved the Problem. To be precise deleting just ~/.popper/popper.cfg would have solved the problem too, because when you open Popper Configurator and this file is missing, a new user-configuration will be created. Set status to "invalid".