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Forum Moderators: mack
Surprise! Now only the newly added graphic displaying OK; all the other graphics only displaying place markers. Somehow, all my "old" image links now suddenly referred to the root directory, in stead of to the /graphics/ directory, and I assume that uploading the "new" graphic to /graphics/ must have had something to do with this. I'm a worried person, because I have never realised that one's code can change spontaneously. Please explain to me what happened here, one moment the page was working fine, the next moment it was not, without being changed by me. PS. The "new" page validated OK with W3C.
I have never realised that one's code can change spontaneously
It can't - so something else must have happened. Uploading an image will have absolutely no effect whatsoever on the HTML markup.
Did you try uploading the HTML file again to see if that corrected the error?