Sorry, here's the full error /usr/autodesk/maya2013-x64/bin/maya.bin: error while loading shared libraries: libXpm.so.4: cannot open shared object file: No such file or directory.

So, glory be to you, as you have solved my problem. Apparently the libXpm-3.5.8-2.el6.x86_64 was not installed, so I ran that, and presto!

Thankyou thankyou thankyou!