No longer ignoring .png files, thanks Mario.

src/model/Board.java

@@ -18,7 +18,8 @@ public class Board {
 	private int numPlies = 0;
 
 	public Board(Board that) {
-		this();
+		board = new TileColor[NUM_ROWS][NUM_COLS];
+		
 		for (int i = 0; i < NUM_COLS; i++) {
 			for (int j = 0; j < NUM_ROWS; j++) {
 				this.board[j][i] = that.board[j][i];