Drupal tip #1 – Locked out of site?
Empty the ‘sessions’ and ‘cache’ tables and login at
yoursite.com?q=user
Drupal tip #2 – random Ajax Error in the workbench?
Check your server memory settings, you may need to increase either the mysql memory or the limits in the php.ini
Find your current php.ini from Drupal Admin -> Reports – > Status Reports.
Scroll down to the PHP line and click ‘more information‘ this will take you to a standard PHPINFO() page for your server.
Look for the Loaded Configuration File line to find where your current php.ini file is.
Consider increasing the Input_Vars limit.
Make sure to restart the server after making changes to the php.ini file.