removing font causes fxml file to break

I just downloaded SceneBuilder 2.0 and wanted to remove something from a file I created in about Nov-Dec of last year. I was removing the center portion of my BorderPane and my scene broke. It would throw the 2 pictures I had to the top left, and all of my components gone.

I tracked it down to a label with a font

 <Label layoutX="21.0" layoutY="240.0" prefHeight="18.0" prefWidth="246.0" text="First Impressions:" underline="true">
              <font>
                <Font name="System Bold" size="20.0" fx:id="x1" />
              </font>
            </Label>
            


if I remove this it will crash. If I exit scenebuilder and try to remove it manually via Netbeans and then restart SceneBuilder I get a "main class exception."... Weird....