Can't find a way to report the bug, so just trying this for now.
I can create a shelf button, and then add a popup item to the button (right-click > Edit Popup...)
But it only keeps the first entry, and adding any more has unexpected results, sometimes appearing at the bottom or the top of the menu list, but usually not showing at all after restarting Maya.
Tried recreating the shelf, restarting, etc. Manually editing the shelf text file seems to work but that's time consuming and prone to error.
Pics show the shelf > popup menu after adding a simple "Sphere" script and trying to add several default popup "User menuItems" with the + button (only one appears). Also a screenshot of the shelf text file - the bottom "popup" lines show as "-mi..."
