[DCP-o-matic] VFs on Sony R515

Hi all, There's a user on the forum who is getting "Failed to refresh DCPs of Library Server, the items in the DCP (Name of DCP) isnt found un Assest Map." when loading a VF (with just subtitles) over an OV DCP. This seems strange. I can't see anywhere that suggests that the *referenced* assets in a VF should be included in its ASSETMAP, and EasyDCP Creator doesn't include them. Does anyone have any clue about what the Sony's problem is here? Thanks! Carl