Hi Mark,
This work-around works for me after logging off, after shutting down, restarting, etc. Just press Win+U. Then start Accessibility Keyboard.

If you log off it may not use your "auto start keyboard when locking" setting; but then you just tap the win+u combination again to start the keyboard again.

There is still the problem of waking up the Averatec from Stand-By or Hibernation while in Tablet mode as the power button is covered by the screen. I'm currently trying to figure this one out (maybe Wake on Lan or Bluetooth?).

Manny