I am getting the following error after updating to 4.7.6:
Warning: Missing argument 1 for CRM_Utils_System_Joomla::getDefaultSiteSettings(), called in /home/mysite/public_html/administrator/components/com_civicrm/civicrm/CRM/Utils/System/Joomla.php on line 687 and defined in /home/mysite/public_html/administrator/components/com_civicrm/civicrm/CRM/Utils/System/Joomla.php on line 698 Error displaying the error page: Application Instantiation Error: Failed to start the session because headers have already been sent by "/home/mysite/public_html/administrator/components/com_civicrm/civicrm/CRM/Utils/System/Joomla.php" at line 698.
I did not have this error in 4.7.4, skipped 4.7.5 update. Running Joomla 3.5.1 and Php 5.5