I'm using Kicad on Linux with the daily builds. The last few days I've had trouble with the routing. Currently it will lay tracks right next to each other, with no clearance.
When I go to Pcbnew->Design Rules->Net Classes Editor, and look at the Clearance for 'Default' it is set to 0. I then created a new blank project, and checked again, and it's 0 there as well.
I can change it to 0,2, so that my routing works as expected, but why has it become 0 in the first place?