It sounds to me like your looking in the wrong place for the problem. If you cant select the race to actually play as there's more than likely a problem with the PlayerRACENAMEHERE.entity
For example at the top of PlayerTech.entity:
TXT
entityType "Player"
raceNameStringID "IDS_PLAYERRACENAME_TECH"
canColonize TRUE
isPsi FALSE
isSelectable TRUE
selectablePriorty 2
capitalShipNameType "CapitalShipTech"
starBaseNameType "StarBaseTech"
The lines isPsi, isSelectable, and selectablePriorty all define whether you can select the race etc so that may be causing your problem of being unable to select the other races. Using the correct counts for the GalaxyScenarioDef file will help, otherwise your game will error out to hell and more than likely minidump upon galaxy generation due to incorrect line reads/counts.
Hope this helps 