I am able to work with images at 100% magnification, but at least once/day, Aperture will freeze, and I just get the spinning beach ball.   I have to force quit in order to recover.  At the point this happens, Activity Monitor is showing at least 75% of the resources as idle.   After force quitting several times, Aperture then needs to rebuild the data base.  

I would appreciate any help in getting this resolved.

Thanks -

Dudley Warner