Express Firmware 6.1.1 Might Disable Screensaver
Peter Horvath wrote in to note that AirPort Express firmware update 6.1.1 disables screen saver mode on a machine that's streaming music. Apple confirmed this for him at a relatively high tech support level. The only solution is to revert to version 6.0 of the firmware. Apple is aware of it, so I imagine we'll see a 6.1.2 release soon.