Strange bump while assigning materials

[Eduard]

Hello people,

Every time I import .dxf-files which were made by Sketchup, I get those bumps (see attached file) while assigning materials. Does anyone know the reason or did anybody make the same experience?

[Eduard]

Ok, I have found a way to avoid this. When exporting the dxf-file, just delete the hoe in "edges". That'll do.