I'm still using Tiger (10.4.11) and Youtube vidoes no longer have sound -- there's an "x" where the volume is on Youtube (see attached jpg). I can't upgrade Flash until I upgrade the OS. I'm using Firefox 3.0.15 and Safari 4.1.3 and Flash 10.3.183.10. I have a 2.33GHz Intel Core 2 Duo MBP with 3GB DDR2 SDRAM. Any ideas on how to fix this without upgrading the OS? I've been searching, and haven't found any solutions.