Paul, I figured out the issue. There were a couple of fields in your profile that you had not entered any info for. One of them was your 'biography' empty field, where members tell us a little about themselves if they like. When I went to add your new profile pic and then clicked to Save the changes, I too got the error message concerning the 'invalid' (empty) Biography field. When I typed in a single period in your blank Bio area, it then was ok to save profile changes. It didn't like that there were any fields still left blank, therefore it wouldn't save new changes until all fields had info entered.
Sorry i know that's not very intuitive. But that's how the software is set up to work. Changing it would be a bit of a project.
I hope you are ok now, and I'm sorry you had to go through that. Really I should have seen that error message using the word "biography" and i should have known from that what the issue was. I learned a long time ago that the wording of error messages can give me valuable clues as to what the issue is.
There was nothing wrong with your photo, and it's up now.
Thanks for your patience and i hope you enjoy it here!
Those irritated by grain of sand best avoid beach.
-Strumelia proverb c.1990