When moving the page tabs the associations to the background pages are broken. The properties show the correct background page, but it isn't used, and it has to be set to some other page, and reset to the correct page in order to correct it. It doesn't just break the moved page, it breaks all of them.

Tested with Pencil 1.1 Rc2: the problem is still there, but it seems to be just a display problem : if you save your file and reload it, it looks fine.

Duplicate of #65.