I successfully posted three images in a new thread last week. I tried to post a single image in another new thread today and I have run into several problems, even though I didn't do anything differently, as far as I can tell.
Today, when I Previewed my Post, I got the ol' Tiny-Blue-Question-Mark Image in place of my image (in Safari).
I then switched browsers (to Firefox) and did the same thing. This resulted in my getting the filename and the size of the file displayed in the Post Preview where the image should be instead of the blue question mark image.
I tried a couple of 'test' posts, using other files, in case my image file had a problem and the same kinds of things happened. When I try to bypass the attachments manager and use the 'Add Image' function instead, I get a URL link to my image (on CA) in my preview, even though it has the appropriate [img] tag in the post.
Even the images that worked for me last week will not work in a new post - even though they are still working in the old post. I'm at a loss.