Posting in the Magento forums has been disabled pending the implementation of a new and improved forum solution which should better serve the community.
For new questions please post at magento.stackexchange.com, the community-run support site for the Magento community. We will be providing updates on the new forum solution soon. For questions or concerns please email email@example.com.
I know this is 5 months old, but I’ve just come across this problem myself today. Solution: make sure you edit the ‘General’ tab under each Store Configuration Scope as well as the overiding ‘Main Website’ option, otherwise the list will be blank.