I have installed the WP on the server first time and everything is fine in the installation process.
However, later when I start to do the posts, I find that any fine images (jpg) when uploading to the Media Library would become broken image. However, when I edit the broken image, I can see the image is fine and can display itself very well.
In addition, it seems that every image in my WP panel is broken. for example, when I try to choose the theme: Appearance> Themes> I find all the themes (including Twenty Thirteen) show broken images icon....