Help me understand this Fatal error: Call to undefined function EntityDefaultMetadataController::bundleOptionsList() With updated modules to recent releases,
Recently this error started appearing when executing 'Modify entity values' in views bulk operations. It happens on all the views in the site.
Indications where to start digging is much appreciated.

Fatal error: Call to undefined function EntityDefaultMetadataController::bundleOptionsList() in /home/cdt/public_html/sites/all/modules/views_bulk_operations/actions/modify.action.inc on line 173
The static method EntityDefaultMetadataController::bundleOptionsList() is a part of Entity API module that VBO is dependant upon. One of your modifiable entity properties needs this method to retrieve options for the modify operation. 

You need to debug why this method isn't available. It's defined in entity.info.inc and should be included if the Entity API module is enabled.