This is the second time I've run into this problem. I'm playing on facebook PC and when I set my ancient islands to upgrade they seem to get hung up. They just keep asking for more and more gems to finish what I've already paid for. The first time it happened and I reported it, it was dealt with super fast. A day or two. It's been almost two months and four support tickets now and I can't do diddly with the ancient world because my habitats aren't upgraded and I have a summoned dragon stuck because there's no place to put him. I keep collecting the resources but it's starting to wear on me a bit. User ID
Edit: Dont share your user ID in public. I removed it for your own safety.