I have no idea why a simple gif image is not being loaded properly. In the html code I have the usual
<img src="/img/loading.gif" alt="Loading" title="Loading" />
and the file is in that folder. The weird thing is that if I place there /img/logo.png the image is loaded properly.
The filename is correct, I’ve even copied and pasted it renaming the original files.
PS tested on Firefox 12, Safari 6.0.2 Chrome 23.0.1271.95 (all for Mac)
It was probably a corrupt gif. Your code should work with some other gif. If you really want to get the corrupt gif to work, try opening it in an image editor program and then resave it as gif (or any other format).