oh, possibly you pressed a button, more specificly the F1-12 button, im sorry but i forgot which one is it that brings the crosshair and names back, im hoping spartan responds to this cause he had the same problem
i believe its F5, but im not sure.
edit: ya i was right, F5 should solve problem, another case closed by shocklink
anyhow, your new so welcome to the world of blockland and enjoy, and if you have any other problems, you can ask anyone without any problems.