Yes, many (if not all) images from ./img/wiki_up/ seem to have been unluckily lost in some sort of migration between servers in the past.
If you (or any user reading this, and willing to help back the Tiki Community) were so kind to help making some new screenshots of the missing ones, it would be great!
Update, hey, you are right, now that I see your updated post above. I removed the align=Center bit in another page I knew where images were not shown from that relative url, and they came back again!
Great! thanks for the tip!