I have a MacBookPro with OS X version 10.7.5, and I use Airfoil (most recent updated version) and Airport Express to listen to streaming music or news on Pandora or Safari by pushing the stream to the speakers on a Bose "radio/stereo." I launch Airfoil (from the dock) and choose to push to the "computer" and to the Bose speakers. A few minutes later, the Bose speaker drops off the Airfoil window. The computer stream stays on. Can you help? I didn't set it up so I cannot tell you anything else. It seems to drop more w/ Safari, not Pandora as much.