Failed to load Chapter 9 from the beginning

I finished chapter 8 and wanted to proceed to chapter 9, so I clicked the icon on the galaxy-map to start the level. It loads at first and the camera starts to fly through the map briefly, but then stops and it always tells me that the savegame is corrupted and needs to be reloaded or to load a previous savegame (which does not exist).

My only options are to restart the whole level, which ends up in the same situation, to return to mainmenu or the send a bug report... and here we are.

zip-file with additional files available, don't know where to upload