Desktop not saving screenshots and being asked for login password
As of 3 days ago, my desktop is now asking for my log in password, every time I want to move an image or file, that is both when importing & exporting.
At the same time the screenshot shortcut stopped working.
When I do my usual command shift 4, the screenshot is captured, but not saved on the desktop as it usually is & not stored anywhere I can find it, also not shown in recents or a spotlight search.
I have no idea what has happened, I have resorted to doing screenshots via Preview, but its an arduous process.
Anyone any ideas please ?
[Re-Titled by Moderator]
iMac 21.5″, macOS 10.14