Have you tried moving the files to another folder to see if it works then?
When you do this, open up the coding. You're obviously going to need to change all the numbers. An efficient way to do this is to press Ctrl + H, and a replace box will appear. Type in _1 into the first box and _# into the second and click replace all. Where the # is is the new preset folder you put the files in. If I'm reading correctly, you've already done this, but maybe trying again will do the trick