Keynote 4.03 crashes just as often as before when you work "heavy" files. Forums are full with Keynote 4.0 issues and Apple is incapable of solving them. You just have to go back to 3,0 version as powerpoint 2008 is even worse than Keynote. Do you have to work with windows to be able to give a presentation with a Mac???? This nightmare has been going on for 8 months and Apple has been hopeless.