Hi,
The language ranks are indeed currently unavailable. They used to be generated on-the-fly, and page loading took about 30s. We haven't decided yet whether it would be best to refresh them every ~24h, or to cut them out completely.
Problem-solver and country ranks can be out of date by at most 10min. Problemsetter ranks, however, are still generated on-the-fly. (The ranks only refer to problems available in the main problemset.)