PSE 10 - I am operating windows 7 and PSE 10. I use it for editing photos, changing backgrounds, , replacing subjects. and etc. The problem is when I finish hours of editing there is still some residue left fromthe cleanup, which is not noticeable until I get ready to print, save, or review the photo. Even then, the regular editing brushes (spot healing, remove blemishes etc.) work but they leave smudges or some type of residue
The differnce in your edited image and printed/saved image is due to viewing on differnt zoom level.
While at the time of editing - afte some sort of adjustments, please check the image at desired/higher zoom level to ensure that editing is done precise or not .