Hi,

1) The MD Megamenu administration UI only works when "Overlay" module is enabled
2) All jQuery versions greater thant 1.5.x will cause a broken layout in administration UI
3) When "Enable mega menu for this item" is unchecked, the ".mm-hover" class will not be added to the item when moving the mouse pointer over it. This is bad in case you want to add a background-image on hovered navigation items.
4) It would be nice to see the link title on added [link] bricks. This would help to identify them faster

Best regards,
fs