So, all I want to do is draw some text to the side of the player inventory screen. I thought I did it correctly like this:

 

public class TickHandlerClient {

@SubscribeEvent
public void renderTick(RenderTickEvent event) {
	Minecraft mc = Minecraft.getMinecraft();
	GuiScreen screen = mc.currentScreen;

	if(mc.theWorld != null) {
		WorldClient world = mc.theWorld;

		if(event.phase == Phase.START) {
			if(screen instanceof GuiInventory) {
				mc.fontRenderer.drawString("TEXT TEXT TEXT TEXT", 176, 166, 4210752);
				System.out.println("Rendered Text");
			}
		}
	}
}
}

 

But, only the printout runs in the console. So what am I doing wrong?

Are you sure your text isn't rendered behind the GUI?

 

Use event.phase == Phase.END and see if that works.