Ah, yeah - that's a different bug. Basically what happened there was you colonized a terran planet that was slotted to be the home world of someone who had signed up for the game but hadn't started yet. In the future those systems will be hidden from view until the player joins the game.

Even right now a standard terran planet will take 4 hours or so to get to 400mu if it's not intended to be a homeworld.