Development has moved at a very high page recently with the migration from the old version of the simulator to the new one, and not surprisingly, this seems to have introduced a couple of bugs, some of which I have now deployed fixes for.
More specifically, I have fixed a bunch of bugs related to the adding of masses to a scenario. The mass orbit helper was very buggy and adding masses without a mass template left a lot to be desired, to say the least. I have also tried to better synchronise the camera with the add mass controls: when you are adding a mass now, the camera focus is set to the primary and the rotating reference frame, as well.
There are other bugs in need of fixing, and I intend to squash them before I move on to introducing some pretty cool improvements and new features.