The way it is:

Open Stream
You see one ore more photos posted from a user
You click on one of this photos
It will load a new site with the photo in its album
You say, ok fine - nice photo, lets back to the stream..
but.......you only have a button "Back to album"

I didnt come from the album, i come from the stream?!
And why should i go to the album, i am already see the albumphotos left in the sidebar?

Maybe some other user can give their opinion about this, in certain circumstances i am the only one feel this a little bit confusing:p