Longstanding site bridge-game.info with longstanding use of Akeeba Backup and Admin Tools both Pro.
Today upgraded to Joomla 2.5.6 from 2.5.4 without any apparent issues - via upload and extraction using CP File Manager.
Then upgraded Akeeba Backup via Live Update without any apparent issues. System restore on.
Then upgraded Akeeba Admin Tools via Live Update. System restore on. Process seemed to go fine reaching success page saying redirect would happen within 5-30 secs. Then after a few secs blank page. Blank page also for entire administrator back end and live site front end.
Renaming .htaccess file did not solve problem. Renamed main.php to main-disable.php and normality returned. No error messages in Admin Tools WAFirewall. IP address not listed in Block list.
Tried reinstalling Admin Tools 3.2.1 by Joomla Extension Manager with same outcome.
Guidance please...
PHP has memory limit of 128Mb.
Have read tickets 20114 and 15172 and also followed troubleshooter for upgrade problems.