Every so often, in three applications (Pages, Numbers, or iWeb, I have not experienced this in any other application), my computer completely freezes. My cursor alternates between the beach ball and a regular cursor about every 30-40 seconds. Other than that my computer is completely locked; even if I scroll over dock icons, the names do not appear over them. I cannot even open the 'Force Quit' box to exit the program. Absolutely nothing works other than holding the power button on my computer. A reinstallation of the programs (and in fact, a reformat of my entire computer) has not solved this. It is very frustrating because every time it happens I lose everything I was working on. Is this a known issue and what can I do to solve it?