So far, Kaitak, Idlewild, Stapleton, Meigs and Gatow seem to be most affected by this.
- Game worlds appear very slow or unresponsive.
- Game worlds build up backlog.
Unfortunately, we're more or less clueless as to what is causing this and why the problem appears now (and not two days or a few weeks ago already). We're almost certain that is has nothing to do with recent patches. The only apparent pattern so far is that the ORS chokes on the calculations for large US airports with presence of huge airlines, mostly in very old game worlds.
At the moment it is hard to tell when we will be able find a solution to the problem. Until then, thank you very much for your patience and understanding.