Just sharing as an FYI. I installed the Smart Tube app on my dudu7, latest beta OS version, and received the following errors after install.
Machine went into black screen mode displaying these two errors. Unable to bring up system bar / tool bar. Only way I was able to escape the black screen loop was via steering wheel control that was able to bring up music folder which then displayed toolbar which allowed me to reboot device. Upon reboot, everything looked OK. 
