When I check your gallery's dynamically generated XML file, I expect to see XML data (the gallery's configuration options and image data) but, instead, the following messages are displayed:
Warning: require_once(GAWD_DIR/wd/start.php): failed to open stream: No such file or directory in /home/mhfm/public_html/wp-content/plugins/wd-google-analytics/google-analytics-wd.php on line 60
Fatal error: require_once(): Failed opening required 'GAWD_DIR/wd/start.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/mhfm/public_html/wp-content/plugins/wd-google-analytics/google-analytics-wd.php on line 60
It looks like the problem is related to the WD Google Analytics plugin which is somehow interfering with the functionality of WP-Juicebox.
Try temporarily deactivating your WD Google Analytics plugin to see if this helps.
Edit:
I've investigated the problem further and it seems to have something to do with the fact that both plugins (WP-Juicebox and WD Google Analytics) have a file named 'config.php'.
I'm not sure of the exact cause of the problem (both files are in different folders and should not interfere with each other) but a workaround seems to be to rename the WP-Juicebox file 'config.php' to 'config2.php' and then also rename the reference to the file on line 275 of the 'wp-juicebox.php' file, changing:
$config_url = plugins_url('config.php?gallery_id=' . $clean_gallery_id, __FILE__);
... to:
$config_url = plugins_url('config2.php?gallery_id=' . $clean_gallery_id, __FILE__);
Please note that the line number above refers to the current version of WP-Juicebox (v1.5.1).
I hope this helps.