I too am having connection problems with the D-Link 655 router and Firefly. If I enable ‘media sharing’ in Windows Media Player 11 it works fine, but I’d rather use Firefly, as I did with my old Netgear router without any problems.
But using the D-Link 655, the SoundBridge cannot see Firefly. As others have found, I can connect without problems to internet radio.
In contradiction to steveluscher, I can connect fine in 802.11b/g/n mode, and I have the newest (1.11) firmware.