.xsession-errors file growing - GLib-CRITICAL

Question

Percebi que, quando eu reinicio meu computador, o arquivo .xsession-errors continua crescendo constantemente. De alguns kilobytes a alguns megabytes. Eu estou usando o Arch Linux com XFCE4. Aqui está a saída do arquivo:

xfce4-session: No SSH authentication agent found
gpg-agent[580]: WARNING: "--write-env-file" is an obsolete option - it has no effect
gpg-agent: a gpg-agent is already running - not starting a new one

(xfce4-session:574): xfce4-session-WARNING **: gpg-agent returned no PID in the variables

** (nm-applet:617): WARNING **: Couldn't connect to accessibility bus: Failed to connect to socket /tmp/dbus-bqDduJf8IV: Connection refused
libpager-Message: Setting the pager rows returned false. Maybe the setting is not applied.

** (polkit-gnome-authentication-agent-1:626): WARNING **: Couldn't connect to accessibility bus: Failed to connect to socket /tmp/dbus-bqDduJf8IV: Connection refused

** (wrapper-2.0:638): WARNING **: Couldn't connect to accessibility bus: Failed to connect to socket /tmp/dbus-bqDduJf8IV: Connection refused

** (wrapper-2.0:633): WARNING **: Couldn't connect to accessibility bus: Failed to connect to socket /tmp/dbus-bqDduJf8IV: Connection refused

** (wrapper-2.0:651): WARNING **: Couldn't connect to accessibility bus: Failed to connect to socket /tmp/dbus-bqDduJf8IV: Connection refused

(wrapper-2.0:633): Gtk-WARNING **: gtk_widget_size_allocate(): attempt to allocate widget with width -3 and height 26

(wrapper-2.0:638): Gtk-WARNING **: gtk_widget_size_allocate(): attempt to allocate widget with width -3 and height 26

(wrapper-2.0:651): Gtk-WARNING **: Negative content width -3 (allocation 1, extents 2x2) while allocating gadget (node button, owner PulseaudioButton)

(Thunar:584): GLib-CRITICAL **: g_file_test: assertion 'filename != NULL' failed

(Thunar:584): GLib-CRITICAL **: g_file_test: assertion 'filename != NULL' failed

(Thunar:584): GLib-CRITICAL **: g_file_test: assertion 'filename != NULL' failed

(Thunar:584): GLib-CRITICAL **: g_file_test: assertion 'filename != NULL' failed

(Thunar:584): GLib-CRITICAL **: g_file_test: assertion 'filename != NULL' failed

(Thunar:584): GLib-CRITICAL **: g_file_test: assertion 'filename != NULL' failed

(Thunar:584): GLib-CRITICAL **: g_file_test: assertion 'filename != NULL' failed

(Thunar:584): GLib-CRITICAL **: g_file_test: assertion 'filename != NULL' failed

(Thunar:584): GLib-CRITICAL **: g_file_test: assertion 'filename != NULL' failed

(Thunar:584): GLib-CRITICAL **: g_file_test: assertion 'filename != NULL' failed

(Thunar:584): GLib-CRITICAL **: g_file_test: assertion 'filename != NULL' failed

(Thunar:584): GLib-CRITICAL **: g_file_test: assertion 'filename != NULL' failed

(Thunar:584): GLib-CRITICAL **: g_file_test: assertion 'filename != NULL' failed

(Thunar:584): GLib-CRITICAL **: g_file_test: assertion 'filename != NULL' failed

(Thunar:584): GLib-CRITICAL **: g_file_test: assertion 'filename != NULL' failed

(Thunar:584): GLib-CRITICAL **: g_file_test: assertion 'filename != NULL' failed

(Thunar:584): GLib-CRITICAL **: g_file_test: assertion 'filename != NULL' failed

(Thunar:584): GLib-CRITICAL **: g_file_test: assertion 'filename != NULL' failed

(mousepad:716): GtkSourceView-CRITICAL **: gtk_source_style_scheme_get_id: assertion 'GTK_IS_SOURCE_STYLE_SCHEME (scheme)' failed

(mousepad:716): GLib-CRITICAL **: g_variant_new_string: assertion 'string != NULL' failed

(mousepad:716): GtkSourceView-CRITICAL **: gtk_source_style_scheme_get_id: assertion 'GTK_IS_SOURCE_STYLE_SCHEME (scheme)' failed

(mousepad:716): GLib-CRITICAL **: g_variant_new_string: assertion 'string != NULL' failed

(mousepad:716): GtkSourceView-CRITICAL **: gtk_source_style_scheme_get_id: assertion 'GTK_IS_SOURCE_STYLE_SCHEME (scheme)' failed

Qual poderia ser a causa dos erros? É muito importante para mim! Muito obrigado!