I fixed my "Print" error. I'm still getting high CPU usage with Openbox using x2go and QT apps not opening after the last update. Here is the full XSession-x2go-errors error log if this helps:
XSession-x2go: X session started for root at Fri Aug 10 00:53:40 UTC 2018
xhost: must be on local machine to add or remove hosts.
localuser:root being added to access control list
xhost: must be on local machine to add or remove hosts.
dbus-update-activation-environment: setting TERM=dumb
dbus-update-activation-environment: setting SHELL=/bin/bash
dbus-update-activation-environment: setting SSH_CLIENT=xxxxxxxxx
dbus-update-activation-environment: setting QT_LINUX_ACCESSIBILITY_ALWAYS_ON=1
dbus-update-activation-environment: setting X2GO_SESSION=root-50-1533862411_stDOPENBOX_dp32
dbus-update-activation-environment: setting X2GO_AGENT_PID=2339
dbus-update-activation-environment: setting USER=root
dbus-update-activation-environment: setting QT_ACCESSIBILITY=1
dbus-update-activation-environment: setting SSH_AUTH_SOCK=/root/.x2go/C-root-50-1533862411_stDOPENBOX_dp32/ssh-agent.PID
dbus-update-activation-environment: setting PULSE_CLIENTCONFIG=/root/.x2go/C-root-50-1533862411_stDOPENBOX_dp32/.pulse-client.conf
dbus-update-activation-environment: setting PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin
dbus-update-activation-environment: setting MAIL=/var/mail/root
dbus-update-activation-environment: setting PWD=/root
dbus-update-activation-environment: setting LANG=en_US.UTF-8
dbus-update-activation-environment: setting QT_GRAPHICSSYSTEM=native
dbus-update-activation-environment: setting XSESSION_EXEC=openbox-session
dbus-update-activation-environment: setting HOME=/root
dbus-update-activation-environment: setting SHLVL=4
dbus-update-activation-environment: setting LOGNAME=root
dbus-update-activation-environment: setting DBUS_SESSION_BUS_ADDRESS=unix:abstract=/tmp/dbus-O72i0ObC0V,guid=3ac317e9aef52623e8dude291c79955b6ce213
dbus-update-activation-environment: setting XDG_DATA_DIRS=/usr/local/share:/usr/share:/var/lib/snapd/desktop
dbus-update-activation-environment: setting SSH_CONNECTION=xxxxxxxxxxxxxxxx
dbus-update-activation-environment: setting XDG_RUNTIME_DIR=/run/user/0
dbus-update-activation-environment: setting DISPLAY=:50
dbus-update-activation-environment: setting STARTUP=/usr/bin/env LD_LIBRARY_PATH= openbox-session
dbus-update-activation-environment: setting XAUTHORITY=/root/.Xauthority
dbus-update-activation-environment: setting _=/usr/bin/dbus-update-activation-environment
dbus-update-activation-environment: warning: error sending to systemd: org.freedesktop.DBus.Error.Spawn.ChildExited: Process org.freedesktop.systemd1 exited with status 1
Openbox-Message: Invalid button "A-Left" in mouse binding
Openbox-Message: Invalid button "A-Middle" in mouse binding
Openbox-Message: Invalid button "A-Up" in mouse binding
Openbox-Message: Invalid button "A-Down" in mouse binding
Openbox-Message: Invalid button "C-A-Up" in mouse binding
Openbox-Message: Invalid button "C-A-Down" in mouse binding
Openbox-Message: Invalid button "A-Up" in mouse binding
Openbox-Message: Invalid button "A-Down" in mouse binding
No composite extension
** (process:2627): WARNING **: Failed to register client: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files
Activating service name='org.a11y.atspi.Registry'
warning : (/build/buildd/cairo-dock-3.4.1/src/implementations/cairo-dock-X-utilities.c:cairo_dock_support_X_extension:729)
XComposite extension not available.
warning : (/build/buildd/cairo-dock-3.4.1/src/implementations/cairo-dock-egl.c:gldi_register_egl_backend:232)
Cairo-Dock was not built with EGL support
Successfully activated service 'org.a11y.atspi.Registry'
warning : (/build/buildd/cairo-dock-3.4.1/src/implementations/cairo-dock-glx.c:_initialize_opengl_backend:129)
couldn't find an appropriate visual, trying to get one without Stencil buffer
(it may cause some little deterioration in the rendering) ...
warning : (/build/buildd/cairo-dock-3.4.1/src/implementations/cairo-dock-glx.c:_initialize_opengl_backend:188)
couldn't find a suitable GLX Visual, OpenGL can't be used.
(sorry to say that, but your graphic card and/or its driver is crappy)
============================================================================
Cairo-Dock version : 3.4.1 Compiled date : Feb 19 2015 18:17:26 Built with GTK : 3.14 Running with OpenGL: 0============================================================================
XIO: fatal IO error 0 (Success) on X server ":50"
after 280 requests (278 known processed) with 0 events remaining.