I have been using Aperture for several months. All of a sudden it asked me to register again - and it would not accept my serial number. My harddrive then had a problem , but Apple replaced it no problems ( Macbook Pro 17in ) Later I contacted apple an received a new serial number. Installation went aok , but everytie i Launch the program it crashes. Anyone else have a problem like this and if you did , will you please share the solution with me ? thanks !