Gwenview fails to display image edit options (kipi)

Gwenview fails to display some of the items in the menus. Lacking are the image edit functions. E.g. crop tool, resize tool and all the batch processing drop down list are absent.

But keyboard shortcuts for applications do work. E.g. Ctrl+C pops out the crop tool, and Ctrl+R displays resize interface.

System: Linux 4.2.0-19-generic x86_64
Plasma: 5.4.3
Gwenview: version 15.08.2 using:
[]KDE Frameworks 5.15.0
]Qt 5.4.2 (built against 5.4.2)
[*]The xcb windowing system
[/list]KiPi: version 4.12.0

I suspect KDE 5-to-4 issues.

There is a wider issue with KiPi in KDE 5: