Hey Peter,
We recently updated our (trial) version of DMX 5, and it appears that I cannot reorder the global attributes. When I am in the "edit global attributes" page, I can reorder the attributes by using the up/down arrow buttons. But when I actually upload a new file or edit an existing file, the global attributes show up in the order which I added them.
I haven't tried this with local attributes, I will do that now and update my thread.
Glenn