TN5250 Full Screen CentOS 6

I just built a CentOS 6.3 machine.  I and trying to do a tn5250 connection to my IBM Iseries machine but I can't get it to go full screen.  I did this on a CentOS 5 machine and it worked just fine.  I'm not sure what my issue is.  

The script I am using is

if [ "$TERM" == "xterm" ]
 /usr/bin/tn5250 sclas400

Any ideas?
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Do you have the .xClients in your directory ?  with one line in it:  xterm

Are you getting an error ?  Anything in the var/log files ?

What happens when you startx ?

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