Connection selected and right clicked, to choose "execute in existing cluster", (choice made), does not result in connection opened.
David Torrejón Vaquerizas
Well, it works for me...
Anyway, there is a "little" glith with Perl's latest Gtk bindings... when you create a context menu, any submenu should be clicked (despite it is already opened) in order to work their underlying buttons.
Please, try it and let me know.
That little glitch was what got me, so you have no problem. Thanks.