Well the servers have been having issues over the last few days so it may well mean that the display of the icon colourisation might take time or remain grey. Buy I wouldn't have thought that would freeze the page.
I don't see it with FF4 and XP Pro SP3.
However there appears to be another bug when Voting, after clicking the vote button the window doesn't close right away. This is in another topic and I have also reported it.
I don't know if that might be a knock on effect if the servers are having issues, slow, etc. then perhaps the window is only closed once the vote is received and a response sent.