Yes. It worked like a charm on a princess. I was using, surprisingly, layers 3 and 4, and in the Design Rule Check layers 1 and 16.
If I want to make a non-4-sided PCB (talking about the limitations), then how can I use the polygon tool to create for instance a hexagonal PCB?
So..it's a problem if I post here instead of choosing the Eagle CAD forum? The reason I choose here is because of the convenience and the fact that is already a topic about this.