Facebook-sharing of my album doesn't work

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Hi!
I have just joined Expono, and have created several albums.
Sharing one of them to Facebook went as a dream, the two others did not.
I do the obvious clicks and choices, the screen darkens a bit, the marker in the middle twiddles a bit, then turns into an x. Clicking this brings me back to the album, without having shared it.

Nils Langeland