I don't know if it is intended for libraries to cost more pop than studies (I don't think they did before). If so, 450 pop is a bit much, especially if you are at war when you pop goes in the red and you can't build any troops for many turns.
Before and after save in zip as well as debug -
http://dl.dropbox.com/u/16872572/before%20libraries.zip
Population before research completes -
Population after libraries are researched -
