@Flohack Indeed, after the recent testing update, the unwanted unstable one has gone.
@Lakotaubp Thanks, that did the job.
@James-T Hmm... thats quite interessting: I ve got the same two issues on my Nexus 4 for months (running OTA-12). Gonna download an painting-app - we will see...
Problem solved. It was nothing to do with the phone or the installer! It was an unstable USB connection!
@advocatux Thanks, it's working now.
@bam a lot of things have changed since October, 2017, that's why it's better to start a fresh thread 😉