Same problem here! When I type the password to open the application it closes. I uninstalled and installed again. I use the latest version 6.4.0.631 and Debian 9. This is the log.
12:49:22 gnome-shell: Window manager warning: Invalid WM_TRANSIENT_FOR window 0x2400006 specified for 0x2400004 (Enpass Set).
12:35:01 gnome-software: 15:35:01:0845 As failed to rescan: Failed to parse /usr/share/applications/enpass.desktop file: cannot process file of type application/x-desktop
12:35:00 gnome-software: 15:35:00:0254 As failed to rescan: Failed to parse /usr/share/applications/enpass.desktop.dpkg-new file: cannot process file of type text/plain
12:31:14 Enpass: Numeric mode unsupported in the posix collation implementation
12:31:14 Enpass: Case insensitive sorting unsupported in the posix collation implementation
12:31:14 Enpass: QQmlComponent: Created graphical object was not placed in the graphics scene.
12:30:47 Enpass: Numeric mode unsupported in the posix collation implementation
12:30:47 Enpass: Case insensitive sorting unsupported in the posix collation implementation
12:30:47 Enpass: QFile::remove: Empty or null file name
12:30:47 Enpass: QQmlComponent: Created graphical object was not placed in the graphics scene.
The last line of the log appears repeatedly.
Another bug, the window 'Crash Report Enpass' keeps opening after sending the report.
Thanks!
