Well, don't know if it is a codec thing, or just a "Flash sucks on the Mac" thing, but I also get no picture, even using Chrome. In Windows with Chrome I get a picture, but the audio is still a little broken up. I wonder if that is in the recording however, perhaps a little bandwidth issue. It doesn't seem to be too bad however, just less than perfect.
In any case, I am going to try to do a screen capture of the Windows playback, and export to H.264 to upload to Vimeo. Unless someone knows a way to actually download the recorded file from AnyMeeting, rather than streaming it? In which case I could just run it through Compressor to H.264.