I have just tried to save a photo here and appear to have a problem with one photo.
First time it came up on computor as "Invalid image"
I tried again and this time my computor wanted to know what program it was opening.
If I save the small image, no problem. This only happens on the full screen.
The photo in question is Kasuga Maru, 18.4.81 Southampton.
I have no problems saving any other photo.