Maps I've tried
CNE NT 2012.10
CNNA NT 2011.40
CNNA NT 2012.10
CNNA NT 2012.30
USA-HAWAII NT 2012.20
USA-HAWAII NT 2012.30
All have been unlocked images just dropped in. No messing with mapsource.
Issue started after I updated FW from 4.00 > 4.30 and updated the maps. Two of the maps worked perfectly fine prior to the updates !
I downloaded the rest of the maps to see if it was a map specific issue.

Any other pointers? :-)