check the hidden profile file in your home directory...
Could be your personal profile script is over riding the system profile script..
/etc/profile - Executed when the user logs in
~/.profile - Executed when the user logs in
~/.bashrc - Executed when BASH is launched
~/.bash_logout - Executed when the user logs out
Since those scripts get executed at login there is no need to reboot (a 'la windows)..
simply log out and back in if you want to test the profile script changes.