interesting. i see that the Cirrus sample does not in fact work on my Mac (snow leopard) running Flash Player 11,2,202,228. however, i was able to do 1:1 P2P using my own bare-bones test SWF.
most likely there is something amiss with the VideoPhoneLabs example that is making it not work with the new Flash Player. i will mention this to that example's author.
unfortunately, it appears this is a bug in Flash Player. it will be addressed in a (hopefully not-too-distant) future release.