This weekend I decided to work on some files that are 5 years old. I opened the PSD files, made changes, and tried to close them. I was told that I could not save the changes as I do not have privileges to do so. These files are not, I repeat, not locked. How am I going to work on them? Any suggestions? The jpg files do not cause the same message to appear; it is only the Photoshop files.
Check the permissons on the folder and drive, not just on the file.