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We're encountering the same problem here.

gnome-control-center

(gnome-control-center:28288): Gdk-WARNING **: The program 'gnome-control-ce=
nter' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadLength (poly request too large or internal Xlib length er=
ro'.
  (Details: serial 153 error_code 16 request_code 147 minor_code 1)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the GDK_SYNCHRONIZE environment
   variable to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error() function.=
)

lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description:    Debian GNU/Linux 7.6 (wheezy)
Release:        7.6
Codename:       wheezy

dpkg -l x2go\* nx\* gnome-session-fallback gnome-control-center | grep ^ii
ii  gnome-control-center                  1:3.4.3.1-2                      =
               amd64        utilities to configure the GNOME desktop
ii  gnome-session-fallback                3.4.2.1-4                        =
               all          GNOME Session Manager - GNOME fallback session
ii  nxagent                               2:3.5.0.28-0x2go1+git20141113.546=
+wheezy.main.1 amd64        NX agent
ii  x2goagent                             2:3.5.0.28-0x2go1+git20141113.546=
+wheezy.main.1 all          X2Go agent
ii  x2goserver                            4.0.1.18-0x2go1+git20141006.949+w=
heezy.main.1   amd64        X2Go server daemon scripts
ii  x2goserver-extensions                 4.0.1.18-0x2go1+git20141006.949+w=
heezy.main.1   all          X2Go server daemon scripts (extensions)
ii  x2goserver-fmbindings                 4.0.1.18-0x2go1+git20141006.949+w=
heezy.main.1   all          Generic (freedesktop-based) file manager bindin=
gs for X2Go
ii  x2goserver-pyhoca                     4.0.1.18-0x2go1+git20141006.949+w=
heezy.main.1   all          X2Go server daemon scripts (add-ons for pyhoca =
client)
ii  x2goserver-xsession                   4.0.1.18-0x2go1+git20141006.949+w=
heezy.main.1   all          X2Go server daemon scripts (Xsession runner)

Is there a workaround we could use to be able to launch gnome-control-cente=
r while you're working on a fix ?



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<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Trebuchet MS&quot;,sans-serif">We&#8217;re encountering the sa=
me problem here.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Trebuchet MS&quot;,sans-serif"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Trebuchet MS&quot;,sans-serif">gnome-control-center
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Trebuchet MS&quot;,sans-serif"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Trebuchet MS&quot;,sans-serif">(gnome-control-center:28288): G=
dk-WARNING **: The program 'gnome-control-center' received an X Window Syst=
em error.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Trebuchet MS&quot;,sans-serif">This probably reflects a bug in=
 the program.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Trebuchet MS&quot;,sans-serif">The error was 'BadLength (poly =
request too large or internal Xlib length erro'.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Trebuchet MS&quot;,sans-serif">&nbsp; (Details: serial 153 err=
or_code 16 request_code 147 minor_code 1)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Trebuchet MS&quot;,sans-serif">&nbsp; (Note to programmers: no=
rmally, X errors are reported asynchronously;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Trebuchet MS&quot;,sans-serif">&nbsp;&nbsp; that is, you will =
receive the error a while after causing it.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Trebuchet MS&quot;,sans-serif">&nbsp;&nbsp; To debug your prog=
ram, run it with the GDK_SYNCHRONIZE environment<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Trebuchet MS&quot;,sans-serif">&nbsp;&nbsp; variable to change=
 this behavior. You can then get a meaningful<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Trebuchet MS&quot;,sans-serif">&nbsp;&nbsp; backtrace from you=
r debugger if you break on the gdk_x_error() function.)<o:p></o:p></span></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Trebuchet MS&quot;,sans-serif"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Trebuchet MS&quot;,sans-serif">lsb_release -a<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Trebuchet MS&quot;,sans-serif">No LSB modules are available.<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Trebuchet MS&quot;,sans-serif">Distributor ID: Debian<o:p></o:=
p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Trebuchet MS&quot;,sans-serif">Description:&nbsp;&nbsp;&nbsp; =
Debian GNU/Linux 7.6 (wheezy)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Trebuchet MS&quot;,sans-serif">Release:&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp; 7.6<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Trebuchet MS&quot;,sans-serif">Codename:&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; wheezy<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Trebuchet MS&quot;,sans-serif"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Trebuchet MS&quot;,sans-serif">dpkg -l x2go\* nx\* gnome-sessi=
on-fallback gnome-control-center | grep ^ii<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Trebuchet MS&quot;,sans-serif">ii&nbsp; gnome-control-center&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp; 1:3.4.3.1-2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;amd64&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
; utilities to configure the GNOME desktop<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Trebuchet MS&quot;,sans-serif">ii&nbsp; gnome-session-fallback=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; 3.4.2.1-4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp; all&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp; GNOME Session Manager - GNOME fallback session<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Trebuchet MS&quot;,sans-serif">ii&nbsp; nxagent&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;2:3.5.0.28-0x2go1&#43;git20141113.546&#43;wheezy.main.1 amd=
64&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NX agent<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Trebuchet MS&quot;,sans-serif">ii&nbsp; x2goagent&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp; 2:3.5.0.28-0x2go1&#43;git20141113.546&#43;wheezy.main.1 all&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; X2Go agent<o:p></o:p></span></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Trebuchet MS&quot;,sans-serif">ii&nbsp; x2goserver&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
 4.0.1.18-0x2go1&#43;git20141006.949&#43;wheezy.main.1&nbsp;&nbsp; amd64&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; X2Go server daemon scripts<o:p></o:=
p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Trebuchet MS&quot;,sans-serif">ii&nbsp; x2goserver-extensions&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp; 4.0.1.18-0x2go1&#43;git20141006.949&#43;wheezy.main.1&=
nbsp;&nbsp; all&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; X2Go =
server daemon scripts (extensions)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Trebuchet MS&quot;,sans-serif">ii&nbsp; x2goserver-fmbindings&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp; &nbsp;&nbsp;4.0.1.18-0x2go1&#43;git20141006.949&#43;wheezy.main.1&=
nbsp;&nbsp; all&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Gener=
ic (freedesktop-based) file manager bindings for
 X2Go<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Trebuchet MS&quot;,sans-serif">ii&nbsp; x2goserver-pyhoca&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 4.0.1.18-0x2go1&#43;git20141006.94=
9&#43;wheezy.main.1&nbsp;&nbsp; all&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; X2Go server daemon scripts (add-ons for pyhoca client)<o:p><=
/o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Trebuchet MS&quot;,sans-serif">ii&nbsp; x2goserver-xsession&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 4.0.1.18-0x2go1&#43;git20141006.949&#43;whee=
zy.main.1&nbsp;&nbsp; all&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp; X2Go server daemon scripts (Xsession runner)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Trebuchet MS&quot;,sans-serif"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Trebuchet MS&quot;,sans-serif">Is there a workaround we could =
use to be able to launch gnome-control-center while you&#8217;re working on=
 a fix ?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Trebuchet MS&quot;,sans-serif"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Trebuchet MS&quot;,sans-serif"><o:p>&nbsp;</o:p></span></p>
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