I have the same issue with my RAZR Maxx, I get a repeating error "Unfortunately, system U/I has stopped". Spoke to Verizon tech support, said it was a know issue with the lapdocks and that I should contact Motorola tech support, an update to fix it was scheduled for September.
The Motorola tech I spoke with was not versed at all in the problem, but on his advice I cleared the data and cache for the Motorola Doc Service app, and the next time I plugged in to the doc, the error message went away, but clearly the interface is broken. What I see is, I believe, supposed to be a landscape view of my main screen, but it is anything but that.
The Lapdock interface is clearly deeply broken right now. Anyone else having this or know anything more.