If you enter more than 480 characters into the message box for the Host Integrity policy option Utility: Show message dialog while logged on with the Symantec Endpoint Protect Manager (SEPM) web console, the text cannot be saved. The text you entered disappears.
There is a 480 character limit for that dialog box for the SEPM web console.
This problem is fixed in Symantec Endpoint Protection 14. For information on how to obtain the latest build of Symantec Endpoint Protection, read Download the latest version of Symantec Endpoint Protection