Thanks for your reply. I only saw it today when I checked the forum (I would have thought I would receive an e-mail when someone replied).
Anyway, I learned that these Flash errors occur only for (the minority of) users that have a certain admin form of the Flash player installed. When my office’s IT people reinstalled Flash, I no longer receive the error message.
Sorry – the plugin is “Page Links To”. And the error message seems to occur before the footer is loaded.