the first few times (5-10x) that i tried to use the lapdock after unboxing, it came up for ~5-10 seconds, it even was letting me use the mouse and stuff, but then just showed me the moto screen.
i did many hard resets already. my thought was that they don't touch the webtop image (which is said to be isolated from the rest).
@codesage - maybe your lapdock has hardware issues
you can try to open it (and verify that this HDMI / USB connector fits well). just remove the screws on the bottom (2 are hidden under rubber feet).