[1.2.3?] Are my saves lost forever with the new update?

[Ten Typ]

[1.2.3?] Lost Save

So yesterday we all got ourselves an update to 1.3 right?
I'm still happy to join this community and the Rimworld realm although my issue is that my previous saves are not working on any given (steam) version. Tried 1.2.2, 1.2.3, 1.2 etc. non of which works properly. Tried with mods, without mods, deleting the game itself and all the other classic choices that I had but nothing seemed to be working. All I'm left with is a blank screen with some numbers and names.
Any idea what happened? This save took few weeks to get to.
Thanks in advance