I'm getting the same result, no chart OR red X.
After the display of your text I get an "extra blue bar" right above the Password, Delete button just above the "reply" section. This is where I think the "image link" should be and the line/band is blank.
This band is not present on a post that does not have an included image.
I have not had problems with .png images before that I know of.
I saved what Wayne posted for me. It came through as a .png and displays fine.
At a loss at moment
Maybe Wayne will copy/paste and post this one !!!
Then I have to go back and study what you sent, I am interested !!!