"Headers already sent" errors

I was receiving a lot of "headers already sent" type errors when trying to access some of the navigation options in my embedded gallery. Particularly when I tried to add a comment to an image or use any of the other options such as "Print on shutterfly.com", "make highlight", etc.

In gallery.module, about line 240 I commented out the following line:

    // print "<!--"; print_r($path) ; print "-->";

Now everything seems to work fine. This hasn't broken anything else that I can tell, yet. It looks like it might be something used for debugging or trying to get clean URIs but I don't know.