Railfan Technology > photoshop CS4 problem

I do a fair amount of work with Adobe CS4 Photoshop.
Recently when I try to crop a picture the whole picture is deleted, not the area outside the 'marching ants'.
Some square slides were scanned rectangular and in trying to crop out the black bar I get a grey screen, if I save it there is no picture when I try to reopen the file.
I cropped at least five hundred slides before the problem arose.
Any suggestions?
I did reload PS from the disk and it did not change this new behavior.
Gus NWPRRHS Archivist

Gus
Is it possible that the inverse command is in some way stuck in reverse.

Dick Foster

Somehow I turned off the options bar.
When I restored it I found the size was set to 1px.
No wonder my photos disappeared.
Thanks for the nudge in the right direction.
Gus