Lyle, the issue is probably what your camera resolution is set for and whether you have to resize the photo to post it (max jpeg size allowed is 2000x2000 pixels or ~146k). I resize most of my photos to 1024 x 768 before posting, to get down to an acceptable file size. If you don't resize, I suspect the forum software will resize it to something too small to see, as seems to have happened (I couldnt make them out either). OTOH, if you set your camera resolution lower for intended forum postings, you may be able to eliminate the resizing step.
Why it turns out better on a Mac, I dunno, but you might need a BMW interface......
Why it turns out better on a Mac, I dunno, but you might need a BMW interface......