Image Not Visible

I have encountered this problem recently, and I can’t seem to figure out what is wrong.

When I upload an image, no problem. WordPress gives me the code to display it:
<img src=’/wp-content/Shoulder.jpg’ alt=’shoulder’ />

Just like always. I copy and paste this directly into my blog.

When I save, publish, and view my blog, I see the alternate text: shoulder

I tried copying and pasting the image code from an image I uploaded in December of last year:
<img src=’/wp-content/1.jpeg’ alt=’arss’ />

This time, when I save, publish, and view my blog, I can see the image just fine. I do not see the alternate text.

I haven’t changed any of the settings between last month and now (that I am aware of), but somehow it won’t display anything I have uploaded since January 1.

My computer info:
Mac Os X 14.4.8
Firefox 1.5.0.7

FYI: When I view my blog in Safari, instead of the alternate text it displays a little blue box with a question mark.