Thanks. I will look into that. Theoretically it should just block building option, and I tested it worked - but this means there are some possibilities when this does not happen...
Later, I reopened the game and opened my savefile, and then yes, it did blocked me from creating new building without crashing. Not sure why it crashed the first time.
No, i didn't had any problem with savefile missing. But to be honest, I didn't loaded savefile that much. I basically played the game in one sitting until the full-grid crash. Then I relaunched the game once and the savefile worked fine.
