The latest safari can't run youtube. Just get black box. Also websites with jpeg attachments don't open. Just blank page. Turned extensions off. Reinstalled flash. Ran permissions repair. Could this be something with java? Use to work.Any help would be appreciated. Thanks
You should read this support page
http://perian.org/#support in case you need to delete older codecs. In Macintosh HD/Library/Quicktime/ delete any files relating to DivX (Perian already has them). However it should be noted that Perian is not an internet plugin and will not play DivX files imbedded on a website. For that you will need the DivX Player browser plugin available from
http://www.divx.com/divx/mac/
I got the attachments viewable by deleting the awesome Screenshot extension.
I do have DivX installed. There are 2 plugins for it. I also have the latest version of Perian. Can't see where their support page shows which codecs are old.