Domain mapping plugin keeps telling me that I'm using old Sunrise.php file even if I replace it

Hi,

1) After installing the plugin I keep receiving a message saying that I'm using an old version of the sunrise.php file even after replacing it with the new one.

"You use old version of /home/macacada/public_html/delicioso.pt/wp-content/sunrise.php file. Please, replace that file with new version which is located by following path: /home/macacada/public_html/delicioso.pt/wp-content/plugins/domain-mapping/sunrise.php."

2) I've already replaced the old file and set define('SUNRISE', 'on') on the wp-config.php.
- If I leave this setting on the config file all I get back is a blank page.
- If I leave this out the site works properly; also, the sunset.php works in this case.

The site is http://www.delicioso.pt. I've enables support access if you need it.

Do you have any ideas on how to fix this?

Environment Configuration Details
PHP
Version 5.3.27
max_execution_time 60
open_basedir
memory_limit 128M
upload_max_filesize 32M
post_max_size 32M
display_errors
log_errors
track_errors
session.auto_start 0
session.cache_expire 180
session.cache_limiter nocache
session.cookie_domain
session.cookie_httponly
session.cookie_lifetime 0
session.cookie_path /
session.cookie_secure
session.gc_divisor 100
session.gc_maxlifetime 1440
session.gc_probability 1
session.referer_check
session.save_handler files
session.save_path /tmp
session.serialize_handler php
session.use_cookies 1
session.use_only_cookies 1
error_reporting 4983
E_ERROR
E_WARNING
E_PARSE
E_CORE_ERROR
E_CORE_WARNING
E_COMPILE_ERROR
E_USER_ERROR
E_USER_WARNING
E_RECOVERABLE_ERROR
E_ALL
MySQL
Version 5.5.34-cll
Driver mysql
key_buffer_size 512 MB
max_allowed_packet 64 MB
max_connections 600
query_cache_limit 5 MB
query_cache_size 128 MB
query_cache_type ON
WordPress
Version 3.8
ABSPATH /home/macacada/public_html/delicioso.pt/
WP_CONTENT_DIR /home/macacada/public_html/delicioso.pt/wp-content
WP_PLUGINS_DIR undefined
SUNRISE undefined
UPLOADBLOGSDIR undefined
UPLOADS undefined
SUBDOMAIN_INSTALL
DOMAIN_CURRENT_SITE http://www.delicioso.pt
PATH_CURRENT_SITE /
SITE_ID_CURRENT_SITE 1
BLOGID_CURRENT_SITE undefined
COOKIE_DOMAIN
COOKIEPATH /
SITECOOKIEPATH /
DISABLE_WP_CRON undefined
ALTERNATE_WP_CRON undefined
DISALLOW_FILE_MODS undefined
WP_HTTP_BLOCK_EXTERNAL undefined
WP_ACCESSIBLE_HOSTS undefined
Web Server
Software Apache
Version Unknown
Address 80.172.234.25
Host frodo.ptwebserv.net
Remote HTTP Requests
WPMU DEV: GET OK
WPMU DEV: POST OK
PayPal API: POST OK