Hi Grizly, the error appears in unmodified and modified osTicket installation. If we make settings in the global php.ini, it doesn't have any effect. This means: disabling/enabling works and it is displayed und Admin Panel > Dashboard > Information correctly, but didn't have any effect. Error Level reporting is set to all.Additional information in Agent Panel > Ticket > Preview e.g. moving mouse over ticket number are displayed correctly, only the ajax information while moving mouse over the orange circle with the questionmark are not displayed. But the debuggers are not showing an error... "GET /scp/ajax.php/tickets/1/preview > will generate no error and shows the preview correctly"GET /scp/ajax.php/help/tips/tickets.queue > will generate no error and shows nothingThe white page appears only if a local php.ini is dropped to scp. The server settings are correct and in any other installation, we have no problems with local php.inis, except in osTicket.Many thanks for your help.