The self-advancing slideshows provided with some of the postings may not show up on some computers. Instead, you may simply see a black box. We're not exactly sure what the problem is, but we have some ideas. The slideshows may not play on mobile-phone-type products (e.g., I-Pad). On regular computers, users may need to have the most up-to-date versions of Flash, Java, or other graphic-display programs installed.