I recently slicked the development environment on one of my laptops and reinstalled everything; ColdFusion, Flex Builder, Eclipse etc.
While testing, I found I could create and run basic projects but creating a Flash Remoting project does not work.
Even if the new application contained simply an mx:application tag and a mx:panel tag, it would throw two runtime errors:
VerifyError: Error #1053: Illegal override of subtopic in mx.messaging.Consumer.
TypeError: Error #1009: Cannot access a property or method of a null object reference.
Tom and João pointed me to a hotfix for FlexBuilder at http://www.adobe.com/go/kb402000. After installation of the hotfix, the errors went away. I should have looked for a hotfix, but since I downloaded a fresh binary, I thought I was above the law! No one is above the law, are they?