I just unsubscribed to all parts (1-5), subscribed again and downloaded, but it changed nothing. Using my old savegame though.

Would it help restarting a chapter? - But I don't see how I can do that, my last save game is after the start of a chapter.

If anyone can help I'd greatly appreciate it - the game is no longer playable with "ERROR" written in 3D text everywhere. The game worked flawlessly on my rig until reaching the Excavator level.