Magento veresion 184.108.40.206 and patch SUPEE-6788 both introduce a new security featuer to Magento. Blocks on the front-end have to be enabled or whitelisted before it will work.
Blocks can be added via a new Admin Panel section under Permissions > Blocks. Adding or allowing a new block is pretty streight forward:
- Navigate to
System > Permissions > Blocks
- Click “Add New Block”
- Enter the block name: e.g.
- Set “Is Allowed” to Yes
- Replace this with the name of the block that has disappeared