[CentOS] Bug with cron ?

Hi,
 
Is there a bug under cron on CentOS 5.2 x86_64 ?   kernel 2.6.18-92
 
Something is strange on my system. I have a simple shell script to run
on many computers . When I run this script by hand, everything works
fine on all workstations.
 
But if I start this script via crontab vmplayer is never install with no
errors.
 
Any ideas ?
Best regards.
 
 
 
#/usr/bin/yum -e 0 -d 0 -y remove VMware-Player.x86_64
#/usr/bin/yum -e 0 -d 0 -y install VMware-Player-2.5.1-126130.x86_64
#/usr/bin/vmware-networks --stop
#/usr/bin/vmware-networks --migrate-network-settings
/vmware/virtualmachine
#/usr/bin/vmware-networks --start
#/sbin/chkconfig --level 345 vmware on
 
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