Blacklisted Shell Script?

Dave <[email protected]>
Newsgroups gmane.user-groups.linux.ottawa.general
Message-ID <[email protected]>
A few days ago a bash shell script that had been working reliably for 
months, suddenly quit working. The script has not been changed.

I see no error messages either from cron, or from manual invocation of 
the script. It's as if I hadn't invoked it.

I wrote a trivial test script that works both manually, or via cron 
(invoked via my crontab entry). But my desired script  produces nothing.

Where do I look to see a hint? Nothing in /var/log/cron or 
/var/log/messages suggests any problem.

Given that a shell script will work as demonstrated by my test script 
(both from a terminal or via cron), why did my desired script suddenly 
quit working, silently? Has my OS blacklisted it?

TIA;
Dave
==============
Technotrivia - Fedora 10 on 2GHz Celeron with one GB RAM.
echo $SHELL = /bin/bash
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