I was using a previous version of OS X and used to connected to a server with an SSH console. It used to run X11 after loading my requested programs (Mathematica) on the remote server and was working properly.
Recently I upgraded my Mac to the latest version (OS X 10.8.4) and SSH is now not loading the "X" anymore. I therefore access my requested programs from the remote server.
How can I fix the problem? I downloaded an extra version of X11 and installed it, but there were connection failures in the graphical interface. It was working with properly with X11 in the previous version.
type xterm
?