Index: trunk/src/obj_subc.c
===================================================================
--- trunk/src/obj_subc.c	(revision 12178)
+++ trunk/src/obj_subc.c	(revision 12179)
@@ -65,6 +65,7 @@
 		if (inv != NULL)
 			pcb_message(PCB_MSG_ERROR, "Invalid character '%c' in subc refdes '%s'\n", *inv, sc->refdes);
 	}
+	pcb_text_dyn_bbox_update(sc->data);
 }
 
 pcb_subc_t *pcb_subc_alloc(void)
Index: trunk/src/obj_text.c
===================================================================
--- trunk/src/obj_text.c	(revision 12178)
+++ trunk/src/obj_text.c	(revision 12179)
@@ -605,11 +605,17 @@
 
 void pcb_text_update(pcb_layer_t *layer, pcb_text_t *text)
 {
-	pcb_poly_restore_to_poly(PCB->Data, PCB_TYPE_TEXT, layer, text);
+	pcb_data_t *data = layer->parent;
+	pcb_board_t *pcb = pcb_data_get_top(data);
+
+	if (pcb == NULL)
+		return;
+
+	pcb_poly_restore_to_poly(data, PCB_TYPE_TEXT, layer, text);
 	pcb_r_delete_entry(layer->text_tree, (pcb_box_t *) text);
-	pcb_text_bbox(pcb_font(PCB, text->fid, 1), text);
+	pcb_text_bbox(pcb_font(pcb, text->fid, 1), text);
 	pcb_r_insert_entry(layer->text_tree, (pcb_box_t *) text, 0);
-	pcb_poly_clear_from_poly(PCB->Data, PCB_TYPE_TEXT, layer, text);
+	pcb_poly_clear_from_poly(data, PCB_TYPE_TEXT, layer, text);
 }
 
 void *pcb_textop_change_flag(pcb_opctx_t *ctx, pcb_layer_t *Layer, pcb_text_t *Text)
@@ -641,6 +647,14 @@
 	return text;
 }
 
+void pcb_text_dyn_bbox_update(pcb_data_t *data)
+{
+	PCB_TEXT_ALL_LOOP(data); {
+		if (PCB_FLAG_TEST(PCB_FLAG_DYNTEXT, text))
+			pcb_text_update(layer, text);
+	} PCB_ENDALL_LOOP;
+}
+
 /*** draw ***/
 
 #define MAX_SIMPLE_POLY_POINTS 256
Index: trunk/src/obj_text.h
===================================================================
--- trunk/src/obj_text.h	(revision 12178)
+++ trunk/src/obj_text.h	(revision 12179)
@@ -65,6 +65,9 @@
 void pcb_text_set_font(pcb_layer_t *layer, pcb_text_t *text, pcb_font_id_t fid);
 void pcb_text_update(pcb_layer_t *layer, pcb_text_t *text);
 
+/* Recalculate the bounding box of all dynamic text objects that are
+   directly under data - useful e.g. on parent attr change */
+void pcb_text_dyn_bbox_update(pcb_data_t *data);
 
 void pcb_text_init(void);
 void pcb_text_uninit(void);