Using openSUSE 42.1 KDE 5.5.4 LO 5.1.0.3 NVidia Cannot select either duplex or paper tray options unless LO KDE4 extensions are installed Installed LO without KDE4 extensions but with Gnome extensions Try to print a document File /Print /Properties All options in Duplex and Paper tray cannot be selected Installed KDE4 Extensions Works OK ( but the reason I left off KDE4 extensions in the first place is the icons look horrible with it installed ) Side effect : Select File /Print /Properties Click on the arrow next to either Duplex or Paper tray to get the dropdown Now you can't click anywhere else ( in any application or the desktop ) until you get rid of the dropdown. Same in Writer and Calc M
The Gtk+ backend implements it's own printer handling. Probably there are some conflicts when used with KDE, not that I can imagine, how that's possible?! As the reporter stated, the KDE VCL backend works, as it relies on LO own printer handling. As an additional info to the reporter: the icon set can be changed independent of the backend via Tools -> Options -> LibreOffice -> View -> Icon style. Not sure, if we want / can to fix Gtk+ VCL. Let's see, if Caolan has an idea.
It should actually be the same dialog in gtk2/gtk3 and kde4 by default and the same printer discovery code I think so I can't think offhand how there could be a difference. Maybe a screenshot of the dialog not working, vs the (almost) working kde case might be helpful
Using 5.2.2 now with KDE 5.7.95 I did not install KDE or GTK3 extension but did install the Gnome ones and it is fine Mal
As stated in comment 3, the bug is fixed in 5.2.