i decided to make it systematically and i think the culprit is ad-block plus with something else. after re-installing several of my before deleted apps and making a list until the same effect of missing software keyboard. always booting for each new app (felt like windows ). it took *two* times booting after ad-block installation. retracing my steps i came to this result.
i do not think it is ad-nlock alone. i believe it might have something to do with additional browsers. i still had the xul-runner of fennec on my device.
if we could isolate it better, it would be more easy to write a bugreport for the two colliding apps.