Hello everyone. I own an iMac for my home computer and a MacBook Pro as my travel computer. Both of them have this exact issue. I have no idea if this is a widespread issue or a feature of the OS. Everytime I turn on either of these computers after a shutdown, my default programs for the internet, opening documents, and viewing PDF files have been reset to the original defaults. Am I missing something here? Both of these computers run Leopard. Any help would be appreciated.