Ok. Maybe some files were not replaced correctly during update. Please rerun the update by using these commands:
Code:
cd /tmp
wget http://www.ispconfig.org/downloads/ISPConfig-3-stable.tar.gz
tar xvfz ISPConfig-3-stable.tar.gz
cd ispconfig3_install/install
php -q update.php
to see if this fixes the issue. Before you do that, check that the mysql root pssword in /usr/local/ispconfig/server/mysql_clientdb.conf is correct.