Alright, now after todays update on Steam, I started my save game and again: ALL my staff incl. management is GONE and so are ALL vehicles! Everything is gone!
My savegame is basically again useless… 
Is that a bug or do I miss something?!?!
This person had a similar problem and Olof answered this:
So I suggest you file a bug report.
If you didn’t save the game after you loaded up your savegame should be fine I guess, just back it up or wait till the next hotfix to play.