Problem with photoshop elements 4.0
 

When I work with images on Photoshop Elements program , everything seems ok,
but when I try to come back and work on a saved image I get this error message:
"COULD NOT COMPLETE YOUR REQUEST BECAUSE AN UNKNOWN OR INVALID JPEG
MARKER TYPE IS FOUND." The image I want is not shown and I cannot work on
it .
Does anyone have this Photoshop program version 4.0 and have the same
problem? (I use a 20" iMac Intel computer with OS X Leopard operating system.):grumpy: