This used to happen to me all the time on all sorts of pages. I haven't noticed it since upgrading to 12.04 so perhaps it has been fixed. I did find the bug re

This used to happen to me all the time on all sorts of pages. I haven't noticed it since upgrading to 12.04 so perhaps it has been fixed. I did find the bug report for it at one point and a workaround is to right-click and open the web inspector. For some reason this forces a re-render that fixes the problem.