Message3409

I have installed jython 2.2.1 on Windows XP and it works fine. I've
tried to install on Z/OS 1.8 and it appears to install correctly
(message Congratulations! You successfully installed Jython 2.2.1 to
directory /u/Y057AHE/jython/install. received. However when I try to run
the graph example, it just hangs. I see 

MVS2 # jythonc --package pygraph Graph.py
import: 'exceptions' as org.python.core.exceptions in builtin modules
Jython 2.2.1 on java1.4.2
import: 'site' as /u/Y057AHE/jython/install/Lib/site.py
import: 'sys' as sys in builtin modules
import: 'os' as org.python.modules.os in builtin modules
import: 'javaos' as /u/Y057AHE/jython/install/Lib/javaos.py
import: 'java' as java package
import: 'File' as java class
import: 'System' as java class
import: 'javapath' as /u/Y057AHE/jython/install/Lib/javapath.py
import: 'IOException' as java class
import: 'UserDict' as /u/Y057AHE/jython/install/Lib/UserDict.py
import: 'time' as org.python.modules.time.Time in builtin modules
import: 'stat' as /u/Y057AHE/jython/install/Lib/stat.py
import: 'string' as /u/Y057AHE/jython/install/Lib/string.py
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then nothing else. Only thing I can do is cancel my session. 

Is there a known problem on Z/OS or have I done something wrong?