Site Files MIA??

So I'm trying to work on tweaking my site. I use the Site Files for site logos, buttons, etc. I wanted to take a look at something in the gallery. I hit the Organizer. I wanted to move one button image next to another to compare their colors. Clicked, drug, dropped it in place. An error message popped, and then went away. Now my gallery says it's EMPTY!



Right now, all my logo, buttons, etc., still appear on the actual site, but I can't see anything in the gallery where I keep them. I also can't find them in other galleries...