I spoke too soon. Went back to Zango. A few "play" items work, most don't. Tried same in Firefox, error message said "please use Internet Explorer 5 or Firefox (Windows) to access this content.
Haven't tried Zango before, so this is new ground for me. In the past, were you able to access its content on the Mac. Sorry to report it seems like another example of Mac-bias on the browser front.