Save image

I am sure somewhere this has been answered but why can't I not save an image I am working on? The program says something we cannot save this file because it is already open or in use?Do we need to save everything save as and overwrite the original file? Thanks in advance. Chris

Are you saving over a network?

WHY would you want to Save over an original file (and lose the original)?

Try SaveAs (another name) but you can't save to a locked CD...