Problem Isolated to Internet Explorer (IE) browser and due to changes in the "compatibility view settings".
To correct the issue perform the following steps:
Note: Starting in 15.4, Internet Explorer 11.0 is no longer supported with the PPM New UX. If you are facing an issue in IE on 15.4 and higher, switch to another supported browser and see if the issue is resolved there. See CA PPM 15.4 Release Notes for more details on this change.