"It seem to be a session definition issue.
You can solved by simply pasting the following code (from users web)
to the file /var/www/html/maint/includes/application_top.php
@ line 137 and insert the line.
if(!isset($_SESSION[‘trixbox_template’])){ $_SESSION[‘trixbox_template’] = ‘default’;}
So it will be as below.
// Template Chooser//include(‘includes/templateChooser.php’);if(!isset($_SESSION[‘trixbox_template’])){ $_SESSION[‘trixbox_template’] = ‘default’;}//setSession(‘templateChoice’, ‘trixbox_template’, $sessionFile);
And DONE"