Fellow divinity Mac users.
First of all Raze, please use this post as reference for any bug-reports and questions. The information here is definite, up to point and quite bitter.
Second, please accept our sincere apology with the saves situation. We do understand that we might severely displeased you or hampered your game experience. The issue as we see it now stretches far beyond QA, developers and OS X. Looks like we have quite an issue with Steam interfering with saves as well. But still, hands down - we take the hit.
So first of all, do not panic, but other than that....
* There is a pretty high chance that your new saves (*.lsv) are in corrupted state, especially if you played Divinity when Steam cloud was still active
* If you can't see your save or can't load your new save (*.lsv) - it's a prime candidate for trash. It's damaged beyond repair
* All your old saves should be fine
* Starting from .78 we don't save in new format - we use old format again, both for Mac & Win
* If your game crashes on startup all of a sudden - the prime suspect should be .lsv save from yesterday
* If your new save file loads fine, then it's fine and you should not re-save it
Once again, sorry for all this mess. We will keep working on new save format and will enable it in future.