Index: placement.c
===================================================================
--- placement.c	(revision 29715)
+++ placement.c	(revision 29716)
@@ -61,7 +61,7 @@
 			}
 			if (tr.on_bottom) {
 				int n;
-				pcb_data_mirror(proto->data, 0, PCB_TXM_SIDE, 1);
+				pcb_data_mirror(proto->data, 0, PCB_TXM_SIDE, 1, 0);
 				for(n = 0; n < proto->data->LayerN; n++) {
 					pcb_layer_t *ly = proto->data->Layer + n;
 					ly->meta.bound.type = pcb_layer_mirror_type(ly->meta.bound.type);