This sounds like it could be the classic "-" in a footprint name bug.
Try "skip-m4" in your project file if you don't happen to use any of PCB's built in M4 footprints. (Even if you do - you may well find PCB can find everything it needs from the "newlib" export of PCB's generated M4 footprint library.
This sounds like it could be the classic "-" in a footprint name bug.
Try "skip-m4" in your project file if you don't happen to use any of PCB's built in M4 footprints. (Even if you do - you may well find PCB can find everything it needs from the "newlib" export of PCB's generated M4 footprint library.