Thanks Ryan. I had no idea that adapters had firmware! Since my adapter was replaced by Apple yesterday and is working fine with the projectors that I use, I'm not going to install the firmware update. It's dated Mar 17, 2009, so I'm guessing that I already got it through one of many software updates that I received from Apple in the last four years. Thanks for the tip though, it might help someone else who isn't located near an Apple Store.