Hi!
I have the same problem. The organization does not work in the gallery.
This is a big problem.
As a fallback solution I can see view the content catalog using the categories without galleries.
Organizing items can then be simply rewriting the numbers in the “Order” in the library or export library, and rewrite it in the exported file (XML or CSV). Then the rewritten file can be imported. This is probably the only solution. In the case of major modifications in the file can be used Notepad ++ or other advanced editor. Unfortunately, it’s too much work.
Organizing the catalog via the Gallery would be much easier. Unfortunately, the gallery is broken.
Do you know of any solutions? thanks.