It hasn't worked right for me on Firefox on Winders for around that long (with AdBlock+ and FlashBlock installed but disabled). And it doesn't work for me on a newly installed copy of Opera.
Apparently it works on Ashton's iMac.
This old T41 ThinkPad doesn't like it at all, though. It never loads the controls in FF, and under Opera the progress bar updates ungodly slowly and the image changes maybe 3 times in the few minutes I gave it. But it hasn't worked on a recent Win7 laptop either.
Oh well. It's hard to complain when it's free.
Cheers,
Scott.