Hi Rob
There is something wrong with one of your images, either it is not of the right type (see manual for allowed types), or you have another file in your image folder that is not an image (tip, it could be a hidden system file, 'desktop.ini' or something ?)
If Videobox comes across a file that is not of the allowed type, or is corrupt, or it is not an image, it will turn off the attract feature to protect itself from crashing.