When I am working on a photo in a folder and I want to save the photo with changes, I was always able to "Save As" and add a new name and save in that folder. Now, all of a sudden, when I go to a folder, chose a photo, make changes, then "Save As", it goes back to the folder I was in previously and saves there. I now have to always remember to "Save As" and look for the folder that I am in and choose it. What happened?
Try resetting the preferences file. Go to Edit>Preferences>General tab and click the Reset Preferences on next launch button. If that doesn't work, please give us a screenshot of your Save As dialog after editing the file.