I frequently see errors such as: "Expected color but found 'null'. from DOM" in the Developer Tools console. I have no idea where these are coming from. When I click on the from DOM link, a seemingly unrelated CSS file is opened at line 1. (It appears that the first CSS file to be included is opened.)
Component: Developer Tools: Debugger → Developer Tools: Console
Are you using a minified CSS file? Can you attach the file in question, or give a URL to the page if it's a public site?
It should appear here: http://www.areweflashyet.com/shumway/examples/inspector/inspector.html?rfile=../as3_tiger/tiger.swf
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