Insert Image buttons, Screen Options & Help button not working

Hi everyone

I just upgraded to the latest version of WP.

Now the insert image/audio/video/media buttons aren’t working. They appear, but when I click nothing happens. Same with the ”help” and ”screen options” buttons.

I’ve tried all the usual things:

-Clearing cache
-Upgrading browser, Java, Flash
-Clearing Java cache
-Trying different browsers (FF, Safari, Chrome)
-Deactivating plugins

I’m on a Mac running OS X 10.5.8

The weird thing is that a friend of mine running Windows was able to log in and use the buttons. I was also able to log in from my iPhone.

So I figure it must be something about my Mac.

Any ideas?

Thanks so much in advance!