When I watch (or try) iSky Live TV, I get only the audio and no video - theres no error message on the screen, just a black/black video box. I don't think it's re-buffering at all - audio is very clear and continuos.
No issues watching non-Live content. I'm on a Mac running Lion 10.7.1. Tried from a Mac mini and an Air, both running Lion - same result. Tried this on both Safari and Chrome.