Just did a little check. Removed Divinity Original Sin folder with all data to a different location. Started the game - it says "create new profile" - did that - quick saved - the game created new Divinity Original Sin folder with QuickSave_0 subfolder - compared this subfolder with old one and discovered that there are new files in the new one - meta.lsb and sanity.lsb. So obviously after the patch this game will not load old save data - there are missing files!
old saves should load fine without those files
i ve received some reports with people having this error , but when i load the saves here, they load fine without any issue
we are looking into this though!