Cheers, having the same issue I studied source codes (nm-tray as well as qtbase) and made several attempts to find a solution on the web and finally came across the following wiki page
<https://wiki.archlinux.org/title/Qt#Configuration_of_Qt5_apps_under_environments_other_than_KDE_Plasma> The issue arises if you do not run any of the desktop environments known by QT. For me, a simple prefix of "XDG_CURRENT_DESKTOP=GNOME" to the nm-tray command works fine :-) Regards -- JHK
