Additionally, you can select File Details which displays the file information for each image next to a small thumbnail. Also, you can resize the view window, which will fit as many thumbnails as possible into that area. I Spy has run out of disk space. This can happen when thumbnailing a large number of images. The only solution is to create more disk space by removing things from your hard drive.
Temp directories and cache sizes are two places to start.
In the meantime, I Spy now thinks that the thumbnails for those images are correct and even a refresh won't fix them. The only way to restore the thumbnails is to either rebuild the catalog by moving and replacing the image or, if it's in the cache, you must purge the cache. You can also open and resave the image to fool I Spy into thinking it's changed, in which case, it will update the thumbnail. A catalog is a single file containing the thumbnails for each image in a directory. The catalog file is located within that directory and must be created by the user.