Quoting EvilSalmon, reply 6I'll try re-installing the game. The old tech tree is gone in the new game, that I see. It just expects me to learn exploration before I can do more quests
If you have any old custom factions, delete them. They are the most common source of this problem, as far as I can tell.
Oh yea, you might want to surf into "My Documents/My Games/Fallen Enchantress" and delete the stuff in the in the "Units" and "Race" folders while reinstalling.
If you have already reinstalled,
just delete everything in the "race" folder,
and everything but the folder called "Icons" in the "Unit" folder
I still wish they would make this an option with the patcher, to delete old custom stuff.
Sincerely
~ Kongdej