X applications won't run after xorg upgrade

["devnull@plugthebox.net" <devnull@plugthebox.net>]

Hello,
I'm on testing, after an upgrade for xorg and all xserver dependencies
some applications such as rdesktop/Xnest/ppracer  don't seem to work
anymore.
i made sure that all dependencies are well installed, it turned out that
xserver-common gives me:
The following packages have unmet dependencies.
  xserver-common: Depends: x11-common (>= 6.8.1) but it is not going to
be installed
E: Broken packages

which is weird since x11-common is installed and X is running, i'm
currently on GDM/Fluxbox/Firefox/Evolution/Mozilla only
rdesktop/Xnest/ppracer give me the following error messages:
 
sadus@exodus:~$ rdesktop IP        
X Error of failed request:  BadValue (integer parameter out of range for
operation)
  Major opcode of failed request:  78 (X_CreateColormap)
  Value in failed request:  0x0
  Serial number of failed request:  7
  Current serial number in output stream:  8

sadus@exodus:~$ Xnest -ac :2
X Error of failed request:  BadValue (integer parameter out of range for
operation)
  Major opcode of failed request:  78 (X_CreateColormap)
  Value in failed request:  0x0
  Serial number of failed request:  7
  Current serial number in output stream:  10

sadus@exodus:~$ ppracer 
PPRacer 0.3.1 --  http://racer.planetpenguin.de 
(c) 2004-2005 The PPRacer team
(c) 1999-2001 Jasmin F. Patry<jfpatry@sunspirestudios.com>
PPRacer comes with ABSOLUTELY NO WARRANTY. This is free software,
and you are welcome to redistribute it under certain conditions.
See http://www.gnu.org/copyleft/gpl.html for details.

X Error of failed request:  BadValue (integer parameter out of range for
operation)
  Major opcode of failed request:  78 (X_CreateColormap)
  Value in failed request:  0x0
  Serial number of failed request:  23
  Current serial number in output stream:  24


thanks in advance,
-- 
devnull@plugthebox.net <devnull@plugthebox.net>