Index: trunk/src_plugins/dialogs/dlg_pref_board.c
===================================================================
--- trunk/src_plugins/dialogs/dlg_pref_board.c	(revision 36085)
+++ trunk/src_plugins/dialogs/dlg_pref_board.c	(revision 36086)
@@ -76,7 +76,8 @@
 
 	newtherm = ctx->dlg[tabdata->wthermscale].val.dbl;
 	if (pcb->ThermScale != newtherm) {
-		pcb->ThermScale = newtherm;
+		pcb_board_chg_thermal_scale(newtherm, 1);
+		pcb_undo_inc_serial();
 		changed = 1;
 	}
 
Index: trunk/src_plugins/dialogs/dlg_pref_sizes.c
===================================================================
--- trunk/src_plugins/dialogs/dlg_pref_sizes.c	(revision 36085)
+++ trunk/src_plugins/dialogs/dlg_pref_sizes.c	(revision 36086)
@@ -59,8 +59,10 @@
 	DEF_TABDATA;
 
 	tabdata->lock++;
-	if ((PCB->hidlib.size_x != ctx->dlg[tabdata->wwidth].val.crd) || (PCB->hidlib.size_y != ctx->dlg[tabdata->wheight].val.crd))
-		pcb_board_resize(ctx->dlg[tabdata->wwidth].val.crd, ctx->dlg[tabdata->wheight].val.crd, 0);
+	if ((PCB->hidlib.size_x != ctx->dlg[tabdata->wwidth].val.crd) || (PCB->hidlib.size_y != ctx->dlg[tabdata->wheight].val.crd)) {
+		pcb_board_resize(ctx->dlg[tabdata->wwidth].val.crd, ctx->dlg[tabdata->wheight].val.crd, 1);
+		pcb_undo_inc_serial();
+	}
 	tabdata->lock--;
 }