Phocus doesn´t show which images already has been exported

[mgz]

Suddenly I realized that the small icon in the thumbnails that showed that a raw file has been exported is missing. What´s happened, (I blame a shortcut-key-combo-sentric colleague, who sometimes looks at the images) and how do I get it back?

[mgz]

Update: I noticed this only happens when Im exporting .dng files. When I´m exporting.jpgs, everything is normal.