the galaxyforge from the download area is the WRONG galaxyforge for rebellion.
rebellion used to be able to use galaxyforge 3 maps, BUT that was stopped in rebellion 1.02. there are three choices
1 use the galaxy forge in the steamapps/rebellion/galaxyforge folder and re-make the map
2 copy the map into the my documents/games/rebellion/galaxyforge folder, and use my rebellion map updater to convert the map from mapversion3 to mapversion 4(for rebellion)
3 put the map into the my documents/..../galaxyforge folder, and use another mapp converting tool called the map verifier
both 2 & 3 utilities can be found in threads in the modding area
hope these choices help
regarding the auto defeat, you NEED at least two players in the map AND a homeworld for each player
harpo