Graves captions cannot be read in the dark with light source on
1. If you move onto a grave tile in the darkness, the following message is generated: "You stumble upon a grave." - OK
2. If you move onto a grave tile in the light, you either read the carvings or couldn't understand them. - OK
3. If you move onto a grave tile in the darkness with light source on (you see the grave and can normally read it) the same message as complete darkness is generated: "You stumble upon a grave." - Not OK
How to reproduce - go to Griffyard, equip amulet of light and check several graves in the dark (char is two tiles away from it) with an attached savegame.