New to libgdx; glitchy graphic when drawing scene with scene2D - libgdx

Question

I'm trying to display a simple text for a menu UI using scene2D, but for some reason nothing is being displayed here. The screen displays pure black.
public class ScreenMenu implements Screen {
MyGame myGame;
SpriteBatch batch;
Stage stage;
Label labelNewGame, labelContinue, labelCredits;
public ScreenMenu(MyGame myGame) {
this.myGame = myGame;
}
#Override
public void show() {
init();
BitmapFont font = initFont();
initLabels(font);
initStage();
}
private void init() {
batch = new SpriteBatch();
}
private BitmapFont initFont() {
return new FontLoader().getMichroma();
}
private void initLabels(BitmapFont font) {
Label.LabelStyle labelStyle = new Label.LabelStyle(font, Color.WHITE);
labelNewGame = new Label("New Game", labelStyle);
labelContinue = new Label("Continue", labelStyle);
labelCredits = new Label("Credits", labelStyle);
}
private void initStage() {
stage = new Stage(new ScreenViewport());
Gdx.input.setInputProcessor(stage);
stage.addActor(labelNewGame);
}
#Override
public void render(float delta) {
GlHelper.clearScreen();
stage.act(delta);
stage.draw();
}
#Override
public void resize(int width, int height) {
stage.getViewport().update(width, height, true);
}
#Override
public void pause() {
}
#Override
public void resume() {
}
#Override
public void hide() {
dispose();
}
#Override
public void dispose() {
myGame.dispose();
batch.dispose();
stage.dispose();
}
}
The following class contains the clearScreen function. If I don't run it, the entire screen becomes super glitchy, but I can see the New Game text.
public class GlHelper {
public static void clearScreen() {
Gdx.gl.glClearColor(0, 0, 0, 0);
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
}
public static void clearScreen(float red, float green, float blue, float alpha) {
Gdx.gl.glClearColor(red, green, blue, alpha);
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
}
}

Answer 1

Do you use?
setBounds(x, y, w, h);
before to add stage for example:
labelNewGame.setBounds(0, 0, 100, 100);
maybe he can help you.

Answer 2

I feel stupid now. In the FontLoader implementation I set the FreeTypeFontParameter color to Color.BLACK. Apparently it overrides the Color.WHITE argument from LabelStyle.