I am making a site (in development) and for some reason I just realized that customers cannot login, check their wishlist, my account page and who knows what else. I'm not really sure what is causing this issue or how long it has been happening for which of course makes it a little harder to solve.
The system.log doesn't seem to be showing anything related when in debug mode but I am under the assumption that it is problem going to be a php error somewhere.
The site is running on Magento 1.8.1 with a custom theme from themeforest.
Link: http://bit.ly/1o9KNs9
The above link sort of shows the furthest you can get and then once I enter valid details and click login, bam, blank page.
Has anybody encountered this problem before or know how to solve it?
Thanks for any help in advance :)
EDIT System log:
2014-02-10T10:15:37+00:00 ERR (3): Warning: simplexml_load_string(): Entity: line 55: parser error : Start tag expected, '<' not found in /var/www/magento/lib/Varien/Simplexml/Config.php on line 510
2014-02-10T10:15:37+00:00 ERR (3): Warning: simplexml_load_string(): --> in /var/www/magento/lib/Varien/Simplexml/Config.php on line 510
2014-02-10T10:15:37+00:00 ERR (3): Warning: simplexml_load_string(): ^ in /var/www/magento/lib/Varien/Simplexml/Config.php on line 510
2014-02-10T10:15:43+00:00 ERR (3): Warning: simplexml_load_string(): Entity: line 55: parser error : Start tag expected, '<' not found in /var/www/magento/lib/Varien/Simplexml/Config.php on line 510
2014-02-10T10:15:43+00:00 ERR (3): Warning: simplexml_load_string(): --> in /var/www/magento/lib/Varien/Simplexml/Config.php on line 510
2014-02-10T10:15:43+00:00 ERR (3): Warning: simplexml_load_string(): ^ in /var/www/magento/lib/Varien/Simplexml/Config.php on line 510
2014-02-10T10:15:45+00:00 ERR (3): Warning: simplexml_load_string(): Entity: line 55: parser error : Start tag expected, '<' not found in /var/www/magento/lib/Varien/Simplexml/Config.php on line 510
2014-02-10T10:15:45+00:00 ERR (3): Warning: simplexml_load_string(): --> in /var/www/magento/lib/Varien/Simplexml/Config.php on line 510
2014-02-10T10:15:45+00:00 ERR (3): Warning: simplexml_load_string(): ^ in /var/www/magento/lib/Varien/Simplexml/Config.php on line 510