I've had this issue before, and it's kind of unpredictable. Youtube sometimes doesn't load right, along with other flash-based (or maybe java?) sites. Here's how it looks: http://i55.tinypic.com/2dk0o5y.png Like I said, I had this before. I just reinstalled OS X Leopard and everything worked fine, until I started updating with the software updater. Maybe the latest java update broke everything? This appears in both Safari and Firefox, so it can't be a browser problem. What I've tried so far: -Repairing disk permissions -uninstalling and reinstalling flash -uninstalling Firefox -Rebooting computer -Rebooting Safari/Firefox Is there anything else I could try? Sometimes it seems to work correctly. When I boot Windows with Bootcamp, youtube works fine, so it's not a youtube problem either. I'm using a mac mini 1.86 ghz dual core with 1 GB ram, mac OS X 10.5.8 I tried the searchfunction, but didn't really found anything. Sorry if it happens to be answered already.