Here the crontab entry (using GUI)

1	*	*	*	*	root	/usr/bin/nice -n20 /etc/LCDmonitor.sh

and here the script:

-rwxr-xr-x  1 root  wheel  1277 May 10 18:28 /etc/LCDmonitor.sh

#!/usr/bin/env sh

# Cheking if LCDd daemon service is installed.
if [ ! -d /usr/local/share/pfSense-pkg-LCDproc ]; then {
echo "Service not installed"; 
exit;
}
fi

#Checking if LCDd Daemon service is Running
if [ ! `/bin/pgrep -x "LCDd"` ]; then echo "LCD Daemon is not running - Start it from GUI"; exit
else
echo "The LCDd Daemon is running"
fi

# Checking if we have duplicated client processes
NOP=`/bin/ps -ax | /usr/bin/grep -I lcdproc_client.php | /usr/bin/grep -v "grep" |wc -l`
# If there are more than 1 process, then print message
if [ $NOP -gt 1 ] ; then echo "More than 1 process is running - Killing Processes and restarting the service";
/bin/ps -A | /usr/bin/grep lcdproc_client.php | /usr/bin/grep -v "grep" | /usr/bin/awk '{print $1}' | /usr/bin/xargs kill -9 $1 
/bin/sleep 2
#Restating the LCDd client
/usr/local/bin/php -f /usr/local/pkg/lcdproc_client.php &
fi

# If there is no client started, We start a single one.
if [ $NOP -eq 0 ] ; then echo "No client process is running - Starting one";
#Starting the LCDd client
/usr/local/bin/php -f /usr/local/pkg/lcdproc_client.php &
echo "A single LCDd client was started"
fi

# If there is a single client process then print message
if [ $NOP -eq 1 ] ; then echo "OK - A single client process is running";
fi

Everything works fine using the Shell, but not under cron.
I have checked an re-checked the paths for the commands. Just don't know what to do anymore.

Any help is very welcome!

Thanks
Fabricio.