For some reason I can no longer build in the data center tree. I should be able to build Xeno Research but neither Data Center or Xeno Research show up. Yet, I can build multiple Computer Cores on each of my planets?? Don't know what happened. To check, I went into god mode and checked the other factions and their build actions looked right. No computer core because they already built it and they get the option to build another data center or xeno research??