What can make the pit crew disappear? I only ask that, because mine have disappeared. I don't think it's to do with the CSM mods, as it happened halfway through a season and other CSM seasons (which worked fine before) now also don't have pitcrew.
What have I changed by mistake to make them run away?
BTW, they still take just as long to change the tyres, especially if you try to double stack a pit stop, as they do when you can see them.