assuming you have sins 1.17/entrenchment 1.03, the galaxy forge maps NEED to be placed here for xp
C:\Documents and Settings\'user name'\Local Settings\Application Data\Ironclad Games\Sins of a Solar Empire\GalaxyForge
NOT in C:\Documents and Settings\'user name'\Local Settings\Application Data\Ironclad Games\Sins of a Solar Empire\GalaxyForge\Entrenchment
?
Also, I tried moving the file, and for some reason, even though I only mapped out four starting positions, it tried to load ten players.
EDIT: OK, tried again. This time, I see the map in Small Scenarios as well as Galaxy Forge.
EDIT AGAIN: Still doesn't work. There are four starting positions, called Player-0-Home, Player-1-Home, Player-2-Home, and Player-3-Home. All are TerranHome type, all are connected to the map, all four and one other planet to which they are connected are outside the star's disk. Might that be it?