Index: trunk/src/data.c
===================================================================
--- trunk/src/data.c	(revision 716)
+++ trunk/src/data.c	(revision 717)
@@ -215,7 +215,8 @@
 {
 	long lid;
 
-	camv->bbox.x1 = camv->bbox.x2 = camv->bbox.y1 = camv->bbox.y2 = 0;
+	camv->bbox.x1 = camv->bbox.y1 = RND_COORD_MAX;
+	camv->bbox.x2 = camv->bbox.y2 = -RND_COORD_MAX;
 	for(lid = 0; lid < camv->layers.used; lid++) {
 		camv_layer_t *ly = (camv_layer_t *)camv->layers.array[lid];
 		if (ly->objs.size != 0) {
@@ -223,6 +224,12 @@
 			rnd_box_bump_point((rnd_box_t *)&camv->bbox, ly->objs.bbox.x2, ly->objs.bbox.y2);
 		}
 	}
+
+	if ((camv->bbox.x1 == RND_COORD_MAX) || (camv->bbox.y1 == RND_COORD_MAX) || (camv->bbox.x2 == -RND_COORD_MAX) || (camv->bbox.y2 == -RND_COORD_MAX)) {
+		/* empty layer - make it 1*1 mm so it's easier to handle */
+		camv->bbox.x1 = camv->bbox.y1 = 0;
+		camv->bbox.x2 = camv->bbox.y2 = RND_MM_TO_COORD(1);
+	}
 }
 
 void camv_layer_select(camv_design_t *camv, int idx)