@elemental there is a web page you can go to, to simplify finding the IP address without using the LCD  http://prospero.blackarrowsoftware.com/ (although that's not much use to you now).
As there were lots of documented problems in getting the LCDs for the Prospero, it is indeed behind the curve in terms of being set up ready to use out of the box.  It's supposed to show you the stats screen after boot, but instead you have to activate it manually.  It was discussed here, for the X-1 http://ecointalk.net/topic/1221-logic-ethos-lcd-wifi-x1s-shipped/?p=15968

It also sounds like you need to update the software.  See http://ecointalk.net/topic/1237-v1-updating-problems/