The _best_ way to check your Cron is to log in to your server via SSH, run the crontab -l command, copy the Cron command (w/o * * * * *) and paste to the terminal command line. Then you hit Enter and if it works, you would just see a new command line. If it doesn't, it would display the error which would help you identifying the problem. Give this method a try, it totally worth it.