Copying and pasting vector masks in Photoshop CS6
March 28 2013.
You've migrated to Photoshop CS6 and find yourself unable to drag vector masks between layers. You can't move them and you can't duplicate them. You can't Alt+Drag them to duplicate them onto another layer. In fact, THEY AREN'T EVEN IN THE LAYER PANEL ANYMORE.
Fear not. You just need to use new keyboard combinations:
Move a vector mask to another layer:
Duplicate a vector mask to another layer: