[Zubersoft]

If you tap the three dots at the far right side of the toolbar and then tap on "Settings", is stylus mode enabled? It sounds to me like it's ignoring your input for some reason. If you turn off stylus mode, does it suddenly start working? If you draw with your finger, does it operate any differently? I'll run some tests on my Samsung Note Pro 12.2" to see if I can reproduce what you are seeing.

Thanks,
Mike

Edit:

I think I've found the cause of the crash you were seeing. It might be a good idea to load the backup file again after updating. I've uploaded a new installer to the same link I provided in the email I sent you.