Luckily I stumbled upon this thread as I was thinking I am missing an update somewhere... so thanks guys for clearing this up. it is sad to not continue with the most current save game but I guess I can wait for the new hotfix.
Additionally, here the official notice within steam to the hotfix#4:
NOTICE: Due to a build error causing new crashes, we’ve rolled back Hotfix 4 for the time being. We'll re-release it as soon as we’ve fixed the cause.
If you’ve saved since updating, you won’t be able to load those saves until we’ve re-published Hotfix 4. You can keep playing on your Hotfix 3 saves, you just won't be able to load saves from today’s Hotfix 4 until it’s pushed live again. Sorry about the inconvenience.
