OK, a couple of questions for the collective here.
Question 1:
Are you still able to see all of your previous saves in .10? And will they still work in .10?
Question 2:
A few of you have mentioned corrupted saves. Explain please. What are you seeing?
Question 1: Yes, and yes.
Question 2: It has nothing to do with "corrupted saves", but more so, saves that the game can't trace due to the new save system. Like Kare said, the game's format of reading saves went from Page 1, save slot 1 through 9; Page 2, save slot 1 through 9 - The way the game reads it, "1-1, 1-2, 1-3" ect... where "1" is the page, and the number to its right is the save slot.
To, Page 1, save slot 1 through 6; Page 2, save slot 1 through 6 - The game now no longer reads 7-9, again, like Kane mentioned. So renaming saves like "1-7, 1-8, 1-9" to, "2-1, 2-2, 2-3" makes the game read them again.
In theory this should be an easy fix. But I can't fathom EVERYONE is going to go through this 'hassle', so to speak. Particularly when they can just activate skip mode and get to where they were within 10 minutes.
EDIT: I just realized that the corrupted saves people are referring to, are most likely the end of 0.10 evening. If you check the ending of 0.10 in 0.10 and in 0.11, Mr. Dots definitely changed that part. Like Tito said, you can't load into something that doesn't exist. So this issue, isn't really an issue at all, but more so along the lines of a developmental change. Nothing to fix here really.