For one project I'm working with a project index using project title, category and tags. The index itself is displaying all projects, also the ones I add, but often either tag or category is empty...
If I got to that page in the backend and update the project index element, then it works fine and everything is shown. There's nothing hidden though, I just double-click on the element and then OK and it updates with all information.
Maybe this bug can be fixed in the next version?