I have been suffering with this issue for a few weeks now. Any flash snippet on a page causing Safari to crash. I had tried everything to fix the issue. Reinstalling flash player, rolling back to flash player 9, changing my DNS servers, Removing all internet plugins, Firefox, running Safari in 32 bit mode, Terminal hacks...all to no avail. I recently was playing around with my desktop and changed the Name of my Mac HD. I then quit and reopened Safari and to my amazement this had solved the issue. Safari now running faster than ever before. Im not sure how exavtly it solves the issue but it sure worked for me!