qmon - Warning: Cannot convert string * to type Pixmap

qmon fails to display icons:

access@grid:~$ qmon
Warning: Cannot convert string "intro" to type Pixmap
Warning: Cannot convert string "toolbar_job" to type Pixmap
Warning: Cannot convert string "toolbar_queue" to type Pixmap
Warning: Cannot convert string "toolbar_submit" to type Pixmap
Warning: Cannot convert string "toolbar_cplx" to type Pixmap
Warning: Cannot convert string "toolbar_host" to type Pixmap
Warning: Cannot convert string "toolbar_cluster" to type Pixmap
Warning: Cannot convert string "toolbar_sched" to type Pixmap
Warning: Cannot convert string "toolbar_calendar" to type Pixmap
Warning: Cannot convert string "toolbar_user" to type Pixmap
Warning: Cannot convert string "toolbar_pe" to type Pixmap
Warning: Cannot convert string "toolbar_ckpt" to type Pixmap
Warning: Cannot convert string "toolbar_ticket" to type Pixmap
Warning: Cannot convert string "toolbar_prj" to type Pixmap
Warning: Cannot convert string "toolbar_rqs" to type Pixmap
Warning: Cannot convert string "toolbar_ar" to type Pixmap
Warning: Cannot convert string "toolbar_browser" to type Pixmap
Warning: Cannot convert string "toolbar_exit" to type Pixmap

The .xpm files do exist in /usr/share/gridengine/pixmaps.

It is possible to get the interface to find them if you create symbolic links without the .xpm extension ( eg: ln -s toolbar_job.xpm toolbar_job ) AND then start qmon from this directory ( cd /usr/share/gridengine/pixmaps && qmon ).

access@grid:~$ lsb_release -rd
Description: Ubuntu 16.04 LTS
Release: 16.04
access@grid:~$

gridengine-qmon/xenial,now 6.2u5-7.4 amd64