You mean the bunch of undefineds? Now that I think of it, yes, sometimes. I suppose this happens when the refresh starts while a new map is loading. (Or was it all zeros -- scores and time left... Can't remember and can't check either right now, the server's empty.) I've got WinXP SP3 *blush* (haven't installed Linux yet on this box).
User feedback on usability: the fact that refresh freezes the browser means I run it in another window, in order to be able browse normally (when my 3G connection takes a break, the freeze can be really long), which kinda defeats it's purpose. And, of course, showing zero players as one undefined player is a bit annoying, though there's no real point in jumping at every passing guest at 3 AM in the morning:-)
Overall, I like this bar, together with the whole forum and community. It doesn't happen often that I register myself as a user after few days' lurking. Never before, in fact.