Hi, and thanks for your response. I'm using the latest version of Firefox - 17, and just started using it, so there's little to nothing in the cache. 3rd party cookies are (were) indeed enabled. I actually just loaded the page in Google Chrome, which I recently stopped using, because it inexplicably muted my audio on several streaming websites - and, oddly ironically, they play on Chrome. I am mystified!
Thx again for your help.