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Im having the same problem as iphotonut...
and it just started doing this.
I edit my photo and it does not save the noise correction...
when i click to edit the photo again the changes are there. I close the edit window and the changes are no longer there
 
may have a solution

So, like most here this random non saving stuff is confusing and frustrating. It really sucks when you have deadlines! But, I've tried something a few times and it seems to work. When you edit your work, you MUST save it by hitting return. I used to just move on to the next pic with arrows but now I hit the return button. I hit it a couple times and it works! Try it and let me know if it works for you.

peace
 
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