I'm wondering if anyone else has suffered this failure.  I've played a custom race, with the Minor Race technology tree.  I was researching Sensors while at war with the Drengin Empire.  After I conquired a planet, outdated build projects appeared in my planetary list, while super projects, like the Galactic Guidebook didn't appear.  I continued to research senors, because the "Eyes of the Universe" come in quite handy.  Upon completion, the entire branch disappeared from my technology tree, so I could only research "sensor arrays."

Oct. 26, 2010

I couldn't figure out what file was corrupted.  I started several new games, and all my social projects were fouled up, no matter what empire or tech.  My solution was to uninstall, delete all folders, and re-install the game.