Juust download it again in each browser.
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It might just be you need to clean out your temporaty internet folders and cookies, etc.
I suggest you download: ATF-Cleaner and CleanUp! - Both free and available to download, probably best from www.download.com.
In that case, uninstall shockwave player, open Firefox or Camino install shockwave when it promts you and then go from there. It's also good to reboot your mac.
Could be your macbook is just rubbish:D
Disk cleanup ;d