Slideshow Not Showing Up and Logo Change

I have two different blogs running gallery. I have not made any changes in the last few days to any settings and everything was fine. Now all the images in the slideshow are gone and the logo doesn't display. All were gone. No files are anywhere. The images were in the Gallery library that is provided with the theme.The text titles are there but it looks like everything has to be uploaded again. In both completely unrelated blogs! What the heck is going on? The images are not there though the blog section appears ok. Because this happened on two unrelated blogs is also suspect. Bug? There is much time and design work invested and I would like to know there is a real fix for this issue before I spend hours reconstructing this and make sure it doesn't happen again.