It works just fine over here. I have RC1. Are you running nightlies?

No, I'm on the original RC1

I'm on OS X 10.5.3

Works for me Tom, same versions, 10.5.3 and FF3 RC1. Maybe an extension screwing it up?

Was thinking the same thing Andy - will check later

greasemonkey? noscript? Anything like that? I have the same environment as you, and I'm not troubled at all.

Do you have AdBlock installed?

I don't have GreaseMonkey or noscript installed.