Troubleshooting Client Process

Hey all,
 I have six or eight Redhat AS3 clients that are being troublesome.

 I've defined a client process in clientlaunch.cfg as:
[mmsclient]
        ENVFILE $HOBBITCLIENTHOME/etc/hobbitclient.cfg
        LOGFILE $HOBBITCLIENTHOME/logs/hobbitclient-mms.log
        CMD $HOBBITCLIENTHOME/scripts/exec_client.sh
        INTERVAL 5m


On the problem servers, it'll launch once at startup
(/etc/init.d/xymon-client start) and then never loops back through.

Does anyone have some pointers on where to go to troubleshoot this?

Thanks!
--Patrick