Hey was just alerted to this post - I had a similar issue with the PHP Google Maps API class that I'm managing (http://code.google.com/p/php-google-map-api/ ) and was alerted to a similar situation today with polylines no longer rendering in FF but working in IE. Here's the post on our FB wall - http://www.facebook.com/permalink.php?story_fbid=208449602506084&id=121455857872126 , but in short, at least for my implementation, it was due to me using "css compliant" color names instead of the full hexadecimal values (AKA: color:"red" instead of color:"#FF0000") - I checked out the page you linked in question, and I noticed that the color value you are passing is #000 - I have a sneaking suspicion that if you change that value to #000000 , you're polylines will start rendering again. This is obviously an issue with the API as a css compliant color declaration shouldn't just stop working, but for some reason that appears to be the case. Let us know if this helps at all, I'm certainly interested to know if that's the cause.
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