I noticed this because I got pop ups telling me to install flash when I know I already have it, but since then I've found that quicktime doesn't work either. I'm guessing that the reality is that safari thinks it has no plugins at all. I've tried reinstalling the plugins. I've replaced the safari application bundle with the copy from my laptop (which still works correctly), and done the same with the internet plugins folder. None of this has helped at all. Firefox however, works fine. Any ideas?