You are right, in RC I can not remove alpha channel. Too bad, because I have no problem, to open PSB files without Alpha channel, in OS X 10.6.5 PS 64bit CS5. Who had a problem with that? I had not once a problem. Maybe you can introduce the function again and write it can possibly come to problems when you remove the alpha channel. As I had said I never had problems in APP B2, with PSB without alpha channel. It was my standart setting for many panoramas.