Can't print from IE11, Chrome works fine

In Internet Explorer only, when users or technicians are signed into Service Desk Plus, if they open a ticket, navigate to Actions > Print Preview then click Print, the following text is printed:

ManageEngine ServiceDesk Plus Page 1 of 1

404

Unfortunately the page

you requested does not exist.

You made a mistake when typing the page address (URL).

Clicked on a broken or incorrect link.

The requested page has been deleted.

Go back and try again Return to home page

The URL down the very bottom of the page is:

https://helpdesk.domain.com/workorder/E0LWZJYX.htm 19/06/2017

This can't be reproduced in Google Chrome, only in IE.

It has been tested on both Windows 7 and Windows 10 machines. Note I have tested printing to several different brand printers, and also by using Microsoft Print to PDF driver, and the PDF contains the same text above also.

This has only recently started happening. Could it be a bug from a recent upgrade? We are running 9.3 Build 9311.