Cron jobs not running

Can anyone provide insight to why my cron jobs are not running? I has tried simple jobs, like a date/time job, and it works.

Below is an example of what I am trying to run:

# Begin Whenever generated tasks for: taxscribe
0 0,6,12,18 * * * /bin/bash -l -c 'cd /home/deploy/taxscribe/releases/20110311205859 && RAILS_ENV=production rake informer:sync:submitted --silent'

0 * * * * /bin/bash -l -c 'cd /home/deploy/taxscribe/releases/20110311205859 && RAILS_ENV=production rake informer:sync:extensions --silent'


0 * * * * /bin/bash -l -c 'cd /home/deploy/taxscribe/releases/20110311205859 && RAILS_ENV=production rake informer:sync:accounts --silent'

# End Whenever generated tasks for: taxscribe

Thanks for your help.