Some more details. I am at work now and have just connected the key in question. The drive display in gnome-disks fills immediately with reasonable information and the drive appears in Nautilus. All fine so far.
Now I click the "eject" button in the upper right corner. The drive disappears from Nautilus, but it is still present in gnome-disks with the half-empty drive display as shown in the screenshot. I can click on "eject" again and again and nothing happens. This is the same strange behaviour that I experienced even before connecting and removing the key. I remove the key from the USB port and click on "eject" and gnome-disks crashes with a segfault. This is also as before. The following is printed to the terminal (as seen on the screenshot); $ LANG=C gnome-disks (gnome-disks:3649): GLib-GObject-WARNING **: The property GtkWidget:margin-left is deprecated and shouldn't be used anymore. It will be removed in a future version. (gnome-disks:3649): GLib-GObject-WARNING **: The property GtkWidget:margin-right is deprecated and shouldn't be used anymore. It will be removed in a future version. (gnome-disks:3649): GLib-GObject-WARNING **: The property GtkAlignment:left-padding is deprecated and shouldn't be used anymore. It will be removed in a future version. (gnome-disks:3649): GLib-GIO-CRITICAL **: g_dbus_interface_get_object: assertion 'G_IS_DBUS_INTERFACE (interface_)' failed (gnome-disks:3649): GLib-GIO-CRITICAL **: g_dbus_interface_get_object: assertion 'G_IS_DBUS_INTERFACE (interface_)' failed Speicherzugriffsfehler - Fabian
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