Well, whilst in OKC, Ray Davis and I did some experimental and top secret testing.
In our tests, we found the pictures run through Apple computer based image software would not upload. Period..
So if I shot in JPG mode, and loaded the image directly from the card, it would load. But if I uploaded the pics into my software, then to the forum,,, no bueno.
We tried Ray's Apple and had the same result. I usually shoot in RAW, so I would always run it through the software.
Ray's opinion is the software is adding something into the header information (that you and I commoners cannot see) and that the bulletin board software doesn't know what to do with it.
Ray is looking for a solution.
Our work-around was to save it as a .dng file, and all was well, but then the board doesn't show a thumbnail of it, so not the greatest solution.