I have a graphic in Illustrator and have cut-and-pasted it to a Photoshop window as a Smart Object. I've done this before and when I need to edit the file, I right click on the Smart Object preview window to the right and click "Edit" and it brings up the file back in Illustrator, where I make my edits.
In this case, however, while the image appears in the thumbnail in Photoshop, when I click "Edit" all that I get is a blank white Illustrator page. There's no text or graphics...but within this same document, when I've done it in the past for other parts of it, this has worked fine. Why isn't the Smart Object showing up again and editable in Illustrator?