Hi there!
I created a simple File in Designer, where I created a couple of Arboarts, but after pasting objects and images, I noticed I could not create more Artbords (even after deling the Artbords themselves, leaving a blank file as seen below):
I didn't notice when the Pages controls appeared on the bottom left side, by the way.
After this, I decided to try and open the file in Publisher, but after a few seconds, it simply closes. Designer and Photo can open it without a problem (the files is left blank, without any object; I simply copied what I needed to another file, so that doesn't concern me, but I wanted to report this anyway).
Best regards!
05. Color.afdesign