I'm having this same issue - if I run a game then return to the LaunchBox library view, all its images will be missing.  If I go to game edit view, other metadata is still present, but it shows 0/0 images.  Images still exist in the directory.  Issue seems to have started after updating to 7.16, though that could be unrelated - it's been at least a month since I last used LaunchBox.   Hoping I do not need to reinstall and rebuild my whole library to resolve this.  Did anyone find a fix yet?