Index: trunk/src/plugins/rt_topo/laa3_solve.c
===================================================================
--- trunk/src/plugins/rt_topo/laa3_solve.c	(revision 1475)
+++ trunk/src/plugins/rt_topo/laa3_solve.c	(revision 1476)
@@ -225,7 +225,7 @@
 	return NULL;
 }
 
-static int laa3_board_has_via(rtrnd_t *ctx, double x, double y, rtrnd_net_t *net)
+static rtrnd_via_t *laa3_board_via_at(rtrnd_t *ctx, double x, double y)
 {
 	rtrnd_rtree_it_t it;
 	rtrnd_rtree_box_t bbox;
@@ -233,7 +233,7 @@
 	bbox.x1 = x - 0.001; bbox.y1 = y - 0.001;
 	bbox.x2 = x + 0.001; bbox.y2 = y + 0.001;
 
-	return (rtrnd_rtree_first(&it, &ctx->board->vias, &bbox) != NULL);
+	return rtrnd_rtree_first(&it, &ctx->board->vias, &bbox);
 }
 
 static void laa3_check_steiner_via(laa3_t *laa3, vtp0_t *vias, rt_topo_laa_2net_t *tn1, int i1, rt_topo_laa_2net_t *tn2, int i2, double x, double y)
@@ -360,9 +360,16 @@
 			for(bi = 1; bi < tn->br.used; bi++) {
 				if (tn->asg[bi] != tn->asg[bi-1]) {
 					char oid[128];
+					rtrnd_via_t *ev;
+
 					sprintf(oid, "rt_topo_v_%ld", vias->used);
-					if (laa3_board_has_via(ctx, tn->br.array[bi].x, tn->br.array[bi].y, net))
-						continue;
+					ev = laa3_board_via_at(ctx, tn->br.array[bi].x, tn->br.array[bi].y);
+					if (ev != NULL) {
+						if (ev->hdr.net == net)
+							continue; /* we already have a via at the right place */
+						/* via, but wrong net; go on placing a new one (on the same spot,
+						   the solver will move it away due to collision) */
+					}
 					via = laa3_find_via(laa3, vias, tn->br.array[bi].x, tn->br.array[bi].y, net);
 					printf(" VIA at %f;%f: %p\n", tn->br.array[bi].x, tn->br.array[bi].y, via);
 					if (via == NULL) {