I've faced this problem in 3 games in a row and it's made DW unplayable or me. Every time I reach the late game (around year 2800) many planets "disappear" the game still treats them like they were existing (I can select them etc) but they become invisible, the same happens to their orbit path. I'm uploading a screen showing an invisible planet with a constructor and mining station on top. This doesn't happen to all the planets, only some (they don't seem to have anything in common)
I've also uploaded a save game showing this problem it's called:
[22.01.2012] Disappearing Planets.rar
