openSUSE Tumbleweed
Recoll 1.23.1
Plasma 5.12.0
Frameworks 5.42.0
Qt 5.10.0
qtcurve 1.9.0
If one right clicks on the toolbar, the context menu has check boxes only, the descriptive text labels are missing.
Also occurs on a default install of openSUSE 42.3 with breeze windeco, widgets, etc.
Screenshot (default breeze): http://paste.opensuse.org/e117393b