Possible bug. Using the website. Chrome 55.0.2883.87 m and Windows 10 (anniversary update).
I am filtered on a particular area (let's say AreaA) and using the Review & Organize section. I had previously been editing various tasks inside this project, but now I want to change the project's area. I clicked on the project in the tree but it's still showing me the last task I clicked on (same project, remember). So, I click away to a different project and click back to this one. Now I see the big folder icon on the right.
I select a different area (AreaB) for the project. Here's where Zendone starts to act funny. It seems partially unresponsive. I can click on tasks and see them change highlight color, but the details for the task don't appear on the right. Clicking on projects does nothing. Clicking on the sync button seems to initiate a sync (it does the 0-100% animation).
I need to refresh the browser page in order to recover. When I do so, it looks like the area was properly moved.