I am using this theme, unmodified, on my personal blog and, despite the fact that apparently it is not maintained anymore by its author, it is still working pretty well.
The only issue I had, seems to be an incompatibility with the default gravatar image in comments: a malformed URL makes it impossibile to show that image (being it the "mystery man" or a generated one): instead, a broken link appears. The (malformed) URL to the image contains the infamous "path_to_url" string.
If anyone is interested in the solution, I solved that issue modifying the functions.php file.
<div class="avatar"><?php echo get_avatar($comment,$size='35',$default='<path_to_url>' ); ?></div>
<div class="avatar"><?php echo get_avatar($comment,$size='35',$default='' ); ?></div>
...and everything went back to normal.