HELP: Cannot get to Webtop mode in ICS!!

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http://forum.xda-developers.com – I have tried this on both the pure/stock first ICS leak and a custom ROM based upon that leak (ScV7) and in both cases, when I connect my Atrix 2 to the Lapdock 500, it *very* briefly displays the correct Webtop 3.0 welcome screen, and then just abandons that and jumps right into "mirror mode" with the notification bar still at the top as usual, and everything blown up to ridiculous size. Exactly ONCE it went into true Webtop/ICS Tablet mode as it was supposed to (notification bar at bottom), but every time after that it just insists on Mirror mode and doesn't under any circumstances (HowTos)