In Rim World, when I open the work tab to set job priorities, some of the boxes are outlined in red for some workers. What does that mean? I know that the lightness of the box indicates sill level and flames are (faintly) shown to indicate passion. But I couldn't figure out what the red outline meant.
The red outline indicates that the pawn assigned to that work has a skill level between 0-3. It's supposed to draw attention to the fact that there may be better pawns available to handle that type of work. Changing the priority on a red-boxed skill like this from 0 (unassigned) to 1-4 should also be accompanied by a "crunching" sound.