This is the error I got when trying to upgrade to 1.1.5 and the SAME thing happens with 1.1.6:
Fatal error: Call to undefined method Mage_Core_Model_Mysql4_Store_Collection::addOrder() in /home/backyard/public_html/app/code/core/Mage/Core/Model/Mysql4/Store/Collection.php on line 121
First off - I am not using Mysql4 .. so I don’t quite understand that.
Secondly - it kills frontend, backend, downloader, etc. I can’t get into anything, and the only solution is to restore a site backup to 1.1.4