Monecraft split screen won't work anymore on my Xbox360?

I recently got Xbox Gold for my Xbox 360 on my birthday (May 6th). Now every time I attempt to play split screen (on Minecraft) it won't even register the icon that says join.
Every thing is perfect back in the t.v. (HDMI cord is all set up.) The tv s also a good tv that does work on multiplayer (Minecraft).
We used to play all the time so I know it's not the tv. So please help me fix this problem.