My friend and I were playing last night and another of the AI players managed to get the research victory. The game didn't end however, and two more players managed to get to 100% still with no game lost screen. Never got the 'keep playing' button when they hit 100% and it said the AI was victorious. Some time later, the diplomacy points went way out of wack, going up by 1500 for both of us about every couple of minutes.
Didn't see this posted anywhere else, I made a save game of it though if needed.