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Perhaps not a bug report, but since it happened on two different sites when I upgraded to 6.x-1.0, I think I'd maybe write it down here to help others.
When I upgraded the connection to taxonomy was lost so suddenly there was no way to sort pictures and place them in different albums.
The problem was solved by editing the Taxonomy called Acidfree albums and connect that to the correct nod type.
Hope it helps someone.
// AdamEvertsson