I don't know what cause this problem "prettyPhoto" or WP 3.5.1 media gallery

I don’t know how to explain then I will tell from the beginning

I bought Theme “Fullscene” from dev “premitheme” in themeforest but they support quite suck then I have to troubleshoot and find the way to fix problem myself then i came here.

After installation and running my site. I got some bugs but the most important is about gallery

When I insert Gallery to portfolio items and click on thumbs they show error message

like “Image cannot be loaded make sure path is correct bla bla bla”

(this theme use prettyphoto)

i try to find solution and found answer that i have to set gallery to link to image file not attachment page

so i follow the instruction but still get the same problem.

I check the code then I found

<dl class=”gallery-item”>
<dt class=”gallery-icon”>
<img width=”150″ height=”150″ src=”http://www.xxx.com/wp-content/uploads/2013/02/IMG_5753-150×150.jpg&#8221; class=”attachment-thumbnail” alt=”IMG_5753″>
</dt>
</dl>

it still link to attachment page.

How can i change link from attachment page to media file ?