Add new comment

not entirely related but you're probably suffering from using a Gtk+ based desktop environments (DE) eg. gnome, xfce, etc. and their native file selection/browser dialogs (File/Open..., File/Save As... etc.). The issue seems to be aggravated when dealing with DE's which are already linked to Gtk3, which I think it's a fact on Fedora 25, while Qtractor is explicitly linked to Gtk2 as for its native LV2 plug-in UI support on Qt5 builds.

please try either or both of the following options:

• View/Options.../Display/Options/Use desktop environment native dialogs: OFF.
• View/Options.../Display/Custom/Style theme: choose any but "Gtk+" nor "(default)": "Plastique" (Qt4) and "Fusion" (Qt5) are the favorites here ;)

hth.
cheers