This happens when the "Break on All Errors" option is set in Firebug. An exception is thrown by the component that we use to track events within Flash using Google Analytics, and this is seen by Firebug as an Error. The exception is handled, so clicking "continue" in Firebug resumes normal operation.

To prevent operation from being interrupted, either unset "Break on All Errors" or disable Firebug for the web page that causes the problem. Hopefully we will be able to update with a version of the component that does not cause this issue.