See the attached image. I was looking in the bug list and the discussion group for a report on this error, but could not find anything. Every simulation run in firefox (29.0.1) on windows 8 looks like this.
In other browsers things are ok, except for the reported https://www.pivotaltracker.com/s/projects/442903/stories/69926466
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<Screenshot 2014-06-12 08.10.35.png>