Pasting adding to all canvases, not just active canvas
 

I'm using OmniGraffle 6 Professional (which as a general matter I really like). I've run into an odd issue, though, on a document I had opened that was created in OG Pro 5. If I copy a text box or a table (or anything) and paste it in the canvas in which I'm working, OG 6 pastes it on to ALL canvases. Then, if I try to delete the objects in the other canvases, it deletes the pasted object in the canvas in which I was trying to paste it.

Has anyone else run across this and have a solution?

Okay, think I figured it out. A new layer that I created defaulted to being a shared layer. I deselected "shared layer" and the problem was solved.