I also change these in slideshow-gallery/views/default/gallery.php
<img src="<?php echo $this -> Html -> timthumb_image_src($slide -> image_path, $this -> get_option('thumbwidth'), $this -> get_option('thumbheight'), 100); ?>" alt="<?php echo $this -> Html -> sanitize($slide -> title); ?>" />
change to:
<img src="<?php echo $this -> Html -> timthumb_image_src(get_bloginfo('url').'/'.$slide -> image_path, $this -> get_option('thumbwidth'), $this -> get_option('thumbheight'), 100); ?>" alt="<?php echo $this -> Html -> sanitize($slide -> title); ?>" />
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in line 51. I think if you want you can change all the path in the images present there.
It worked for me.