I sent my Troop-Transport to an enemy-world but it would not invade. It still had some movement-points left so i moved it around the planet to invade until it had none.
But now the game did not proceed. There was no turn/skip-button and going to the menu did not work. I thought about killing that bugged transport but the ships-menu would not open either.
I am not sure if the bug was caused by the transport or if the transport-thing was a result from the bug. Unforunately i restarted the game after that so my debug.err from that session is lost.
If it should occur again, i will post it.