When the research breakthrough screen comes up to allow you to select the breakthough you'd like, it displays what that breakthrough unlocks, and what it leads to.  If you click on any of the icons it brings up its data screen.  Now, when I click the 'X' in the top right to close this screen, the sound effect for the screen closing (page turning sounds) plays however the screen doesn't close.  If I click the 'X' again, my game crashes.  This appears to happen only by doing this this way - clicking on the icons in the actual Research window in Kingdom Info doesn't seem to crash the game.  This has happened three times - which is every time I've tried.