If you select and album, then view it, then go to the 'select an album' menu again, you won't be able to select the same album. I guess this was done on purpose because the album is already open, and you can press cancel to go back to it.
However, for ease of use, I think that you should be able to select the same album that you are viewing again. It may seems small but when I tried it the first couple times, I thought it was a bug in the gallery, or that it had frozen up. I think this may cause some confusion for some users. So, please make it possible to select the same gallery that you were already viewing.
Thanks