Linux Mint 19 - black rectangular outline, and nothing more

[ALinuxUser]

Screenshot: https://imgur.com/a/K2OVtrP

cairo-dock -v
3.4.1

Starting with cairo-dock -c doesn't help either. Nor does disabling OpenGL support.

The terminal shows this:

cairo-dock -c
warning : (/build/cairo-dock-2Q_KQp/cairo-dock-3.4.1/src/implementations/cairo-dock-egl.c:gldi_register_egl_backend:232)
  Cairo-Dock was not built with EGL support

 ============================================================================
 Cairo-Dock version : 3.4.1
 Compiled date : Mar 17 2018 11:52:43
 Built with GTK : 3.22
 Running with OpenGL: 0
 ============================================================================

g_file_test: assertion 'filename != NULL' failed
g_file_test: assertion 'filename != NULL' failed

(cairo-dock:10586): Gtk-WARNING **: 03:14:36.854: Theme parsing error: <data>:7:1467: The :insensitive pseudo-class is deprecated. Use :disabled instead.

(cairo-dock:10586): Gtk-WARNING **: 03:14:36.854: Theme parsing error: <data>:7:3649: The :inconsistent pseudo-class is deprecated. Use :indeterminate instead.
sh: 1: /usr/lib/x86_64-linux-gnu/cairo-dock/cairo-dock-launcher-API-daemon: not found
warning : (/build/cairo-dock-plug-ins-VqUvWF/cairo-dock-plug-ins-3.4.1/shortcuts/src/applet-drives.c:cd_shortcuts_list_drives:321)
  couldn't detect any drives
warning : (/build/cairo-dock-plug-ins-VqUvWF/cairo-dock-plug-ins-3.4.1/shortcuts/src/applet-load-icons.c:cd_shortcuts_build_shortcuts_from_data:310)
  Shortcuts : can't monitor bookmarks

MMMMMMMMMMMMMMMMMMMMMMMMMmds+.
MMm----::-://////////////oymNMd+` -----------
MMd /++ -sNMd: OS: Linux Mint 19 Tara x86_64
MMNso/` dMM `.::-. .-::.` .hMN: Host: 20KHCTO1WW ThinkPad X1 Carbon 6th
ddddMMh dMM :hNMNMNhNMNMNh: `NMm Kernel: 4.17.4-041704-generic
    NMm dMM .NMN/-+MMM+-/NMN` dMM Uptime: 5 hours, 53 mins
    NMm dMM -MMm `MMM dMM. dMM Packages: 3854 (dpkg)
    NMm dMM -MMm `MMM dMM. dMM Shell: bash 4.4.19
    NMm dMM .mmd `mmm yMM. dMM Resolution: 2560x1440
    NMm dMM` ..` ... ydm. dMM DE: Cinnamon 3.8.7
    hMM- +MMd/-------...-:sdds dMM WM: Mutter (Muffin)
    -NMm- :hNMNNNmdddddddddy/` dMM WM Theme: Mint-Y-Dark (Mint-Y-Dark)
     -dMNs-``-::::-------.`` dMM Theme: Mint-Y-Dark [GTK2/3]
      `/dMNmy+/:-------------:/yMMM Icons: Paper [GTK2/3]
         ./ydNMMMMMMMMMMMMMMMMMMMMM Terminal: xfce4-terminal
            .MMMMMMMMMMMMMMMMMMM Terminal Font: Consolas 12
                                      CPU: Intel i7-8550U (8) @ 4.000GHz
                                      GPU: Intel UHD Graphics 620
                                      Memory: 5551MiB / 15934MiB