The "Simulation Active" message kept flashing on the screen even after the simulation ended. It even stayed when I went back to the main menu. Also, if the Launch Site Selector window isn't "cancelled" it will similarly stay open even when you leave the editor (even in the main menu).
Edit: Alright, I can't reproduce the first one, but the launch site selector happens every time I leave without cancelling that window.
Also, I can't get it to show me the cost during the simulation, despite having that option selected.
Edit: N/M It's hidden behind a doodad connected to my clock. Is there any way I can make that cost always on top or to move it?
Aaand... sorry for all this, but I've got another glitch - it keeps resetting my ships to earlier than the actual moment of launch. In one, I reduced the amount of fuel in a tank, and after the sim, the fuel was returned to max. Earlier, it reverted my staging to a previous setup.
Edit: I got another glitch. I turned on wireframe (which is awesome, btw), but it's keeping the wireframes when I leave the simulation, i.e. the main base screen, with all the buildings. This persisted after loading a game.