Occasionally there is a need to debug some Magento problem you may be experiencing.

1. Enable error reporting
   In Magento’s index.php uncomment the following:

   #ini_set('display_errors', 1);

2. Turn on Magento Developer logging.
   In Magento admin System -> Configuration -> Advanced -> Developer -> Log Settings set Enabled = Yes
   This allows you to look in the magento/var/log/* log files for any errors
3. Look at server error logs.
   On Red Hat /var/log/httpd/error_log

If problems persist try:

• Turn off Magento cache from admin
  System -> Cache Management then Select All then Select Action – Disable followed by Submit
• Re-Index Magento
  System -> Index Management then Select All and then Submit
• Unmerge Javascript and CSS files
  In Magento admin System -> Configuration -> Advanced -> Developer -> Javascript Settings set Merge Javascript Files = No
  In Magento admin System -> Configuration -> Advanced -> Developer -> CSS Settings set Merge CSS Files = No
• Use php’s var_export() function within your code. Combine it with php’s error_log() function to display errors in your server error_log.