You can craft a cork to use on them to keep them from resetting! Should be available just from the inventory crafting I believe.
You're talking about the "file not found" thing, right?
My solution to that was to copy the file it's supposed to be referencing, then rename that file to what the system is trying to find.
To find these files, go to where the folder for your game is, go to folder "www", go to folder "img", then go to folder "characters". The difficult part looks to be finding which character it is now, because it looks like they've all been renamed.