Lancement de Valknut et DC++ impossible

Bonjour,

Je rencontre actuellement une erreur au lancement de Valknut et DC++ qui provoque leur fermeture.
Quelqu'un pourrait-il me dire d'où vient l'erreur ? Voici les informations de débogage fournies par Valknut :

Linux version 2.6.28-11-generic (buildd@palmer) (gcc version 4.3.3 (Ubuntu 4.3.3-5ubuntu4) ) #42-Ubuntu SMP Fri Apr 17 01:57:59 UTC 2009

Valknut: 0.3.13
DCLIB: 0.3.13
QT compiled: 3.3.8b
QT used: 3.3.8b
LIBXML compiled: 20632
LIBXML used: 20632

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[Thread debugging using libthread_db enabled]
[New Thread 0xb7037700 (LWP 14160)]
[New Thread 0xb5d41b90 (LWP 14177)]
[New Thread 0xb66b9b90 (LWP 14162)]
[New Thread 0xb6ebab90 (LWP 14161)]
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0xb80d6430 in __kernel_vsyscall ()
#0  0xb80d6430 in __kernel_vsyscall ()
No symbol table info available.
#1  0xb716b7b1 in select () from /lib/tls/i686/cmov/libc.so.6
No symbol table info available.
#2  0xb77f5be8 in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3
No symbol table info available.
#3  0xb7863f00 in QEventLoop::enterLoop () from /usr/lib/libqt-mt.so.3
No symbol table info available.
#4  0xb7863dc6 in QEventLoop::exec () from /usr/lib/libqt-mt.so.3
No symbol table info available.
#5  0xb784bb8f in QApplication::exec () from /usr/lib/libqt-mt.so.3
No symbol table info available.
#6  0x080ce193 in ?? ()
No symbol table info available.
#7  0xb70a5775 in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6
No symbol table info available.
#8  0x08066ac1 in ?? ()
No symbol table info available.
The program is running.  Quit anyway (and detach it)? (y or n) [answered Y; input not from terminal]

Et ce que j'obtiens en lançant DC++ à partir d'un terminal :

Loading: Hash database
Loading: Shared Files
Loading: Download Queue
linuxdcpp: Fatal IO error 11 (Ressource temporairement non disponible) on X server :0.0.

Merci d'avance.