Another .xsession-errors log from a Cinnamon crash

.xsession-errors

/etc/mdm/Xsession: Beginning session setup...
localuser:wchargin being added to access control list
Script for none started at run_im.
Script for auto started at run_im.
Script for default started at run_im.
Failed to connect to the VirtualBox kernel service
Failed to connect to the VirtualBox kernel service
Failed to connect to the VirtualBox kernel service
Failed to connect to the VirtualBox kernel service
Failed to connect to the VirtualBox kernel service
Script for none started at run_im.
Script for auto started at run_im.
Script for default started at run_im.
GNOME_KEYRING_CONTROL=/run/user/1000/keyring-PrdBfu
SSH_AUTH_SOCK=/run/user/1000/keyring-PrdBfu/ssh
GNOME_KEYRING_CONTROL=/run/user/1000/keyring-PrdBfu
SSH_AUTH_SOCK=/run/user/1000/keyring-PrdBfu/ssh
GNOME_KEYRING_CONTROL=/run/user/1000/keyring-PrdBfu
SSH_AUTH_SOCK=/run/user/1000/keyring-PrdBfu/ssh
GPG_AGENT_INFO=/run/user/1000/keyring-PrdBfu/gpg:0:1
GNOME_KEYRING_CONTROL=/run/user/1000/keyring-PrdBfu
SSH_AUTH_SOCK=/run/user/1000/keyring-PrdBfu/ssh
GPG_AGENT_INFO=/run/user/1000/keyring-PrdBfu/gpg:0:1
cinnamon-session[2224]: WARNING: Failed to start app: Unable to start application: Failed to execute child process "/usr/sbin/synconf.sh" (No such file or directory)
Starting Dropbox...Cjs-Message: JS LOG: About to start Cinnamon
nm-applet-Message: using fallback from indicator to GtkStatusIcon

** (nemo:2689): WARNING **: Can not determine workarea, guessing at layout
St-Message: cogl npot texture sizes SUPPORTED
Window manager warning: Trying to remove non-existent custom keybinding "magnifier-zoom-in".
Window manager warning: Trying to remove non-existent custom keybinding "magnifier-zoom-out".
Cjs-Message: JS LOG: Cinnamon started at Mon Nov 09 2015 18:01:21 GMT-0800 (PST)
Dropbox isn't running!
Done!
Cjs-Message: JS LOG: network applet: Cannot find connection for active (or connection cannot be read)
failed to create drawable
Cjs-Message: JS LOG: network applet: Found connection for active
mintUpdate: no process found

(mintUpdate.py:3603): libglade-WARNING **: unknown attribute `swapped' for <signal>.

(mintUpdate.py:3603): libglade-WARNING **: unknown attribute `swapped' for <signal>.

(mintUpdate.py:3603): libglade-WARNING **: unknown attribute `swapped' for <signal>.

(mintUpdate.py:3603): libglade-WARNING **: unknown attribute `swapped' for <signal>.
Window manager warning: Log level 16: STACK_OP_RAISE_ABOVE: sibling window 0x2a0003e not in stack
Window manager warning: Log level 16: STACK_OP_LOWER_BELOW: sibling window 0x2a0003e not in stack
Cjs-Message: JS LOG: Removing an access point that was never added
Cjs-Message: JS LOG: Removing an access point that was never added
Cjs-Message: JS LOG: Removing an access point that was never added
Cjs-Message: JS LOG: Removing an access point that was never added
Cjs-Message: JS LOG: Removing an access point that was never added
Cjs-Message: JS LOG: Removing an access point that was never added
Cjs-Message: JS LOG: Removing an access point that was never added
Cjs-Message: JS LOG: Removing an access point that was never added
Cjs-Message: JS LOG: Removing an access point that was never added
Window manager warning: Log level 16: STACK_OP_RAISE_ABOVE: sibling window 0x2a00048 not in stack
Window manager warning: Log level 16: STACK_OP_LOWER_BELOW: sibling window 0x2a00048 not in stack
Window manager warning: Log level 16: STACK_OP_RAISE_ABOVE: sibling window 0x2a00074 not in stack
Window manager warning: Log level 16: STACK_OP_LOWER_BELOW: sibling window 0x2a00074 not in stack
Cjs-Message: JS LOG: Removing an access point that was never added
Cjs-Message: JS LOG: Removing an access point that was never added
Cjs-Message: JS LOG: Removing an access point that was never added
Window manager warning: Log level 16: STACK_OP_RAISE_ABOVE: sibling window 0x2a00075 not in stack
Window manager warning: Log level 16: STACK_OP_LOWER_BELOW: sibling window 0x2a00075 not in stack
Cjs-Message: JS LOG: Removing an access point that was never added
Cjs-Message: JS LOG: Removing an access point that was never added
Window manager warning: Log level 16: STACK_OP_RAISE_ABOVE: sibling window 0x2a0007c not in stack
Window manager warning: Log level 16: STACK_OP_LOWER_BELOW: sibling window 0x2a0007c not in stack
Cjs-Message: JS LOG: Removing an access point that was never added
Cjs-Message: JS LOG: Removing an access point that was never added
Window manager warning: Log level 8: gdk_window_get_support_multidevice: assertion 'GDK_IS_WINDOW (window)' failed
Window manager warning: Log level 8: gdk_window_get_effective_parent: assertion 'GDK_IS_WINDOW (window)' failed
Window manager warning: Log level 8: g_object_ref: assertion 'G_IS_OBJECT (object)' failed
Window manager warning: Log level 8: g_object_ref: assertion 'G_IS_OBJECT (object)' failed
Window manager warning: Log level 8: gdk_window_get_device_position_double: assertion 'GDK_IS_WINDOW (window)' failed
cinnamon-session[2224]: WARNING: Application 'cinnamon.desktop' killed by signal 15
Cjs-Message: JS LOG: About to start Cinnamon
St-Message: cogl npot texture sizes SUPPORTED
Window manager warning: Trying to remove non-existent custom keybinding "magnifier-zoom-in".
Window manager warning: Trying to remove non-existent custom keybinding "magnifier-zoom-out".
Cjs-Message: JS LOG: Cinnamon started at Mon Nov 09 2015 18:37:17 GMT-0800 (PST)
Cjs-Message: JS LOG: network applet: Cannot find connection for active (or connection cannot be read)
Cjs-Message: JS LOG: network applet: Found connection for active

(gnome-terminal:5138): GLib-GIO-CRITICAL **: g_settings_get: the format string may not contain '&' (key 'monospace-font-name' from schema 'org.gnome.desktop.interface'). This call will probably stop working with a future version of glib.