Ok, so here's the situation: my girlfriend bought a premium content for Kingdom Rush and now she has no access to her online saves for about a month already. We've tried on three different machines and two different browsers (Chrome and Opera) and that's what we get: A title screen with save panels, and Online Save panel has only one clickable slot that says "New game" and two others that permanently stuck on loading animation. After the first click on the first slot there is an animation as if game will transfer us to the game map, but then we are thrown on the title screen and after that we cannot do anything. Clicking the first slot will give nothing, and no matter how long we wait, the other two online saves won't load. Cleaning the cache and cookies does not do any better. We googled the problem several times but found nothing.
Sadly, it looks like the save games are corrupted. There is nothing I can do but clear them, which Boppins is working on right now. It's rare, but it happens. Tell her sorry for me.