Winform text are unvisible

[Manudwarf]

Binary package hint: mono

(using xubuntu Karmic Koala 2.6.31-14-generic kernel)
(using libmono 2.4.2.3)

When I run a Winform application, text such as menu items or buttons are unvisible (see screenshot), what is not really usefull... I tried to change my desktop theme, what did nothing at all.

PS : I'm a french guy, also my english is not perfect :/

ProblemType: Bug
Architecture: i386
Date: Wed Nov 11 22:03:52 2009
DistroRelease: Ubuntu 9.10
NonfreeKernelModules: wl
Package: libmono-winforms2.0-cil 2.4.2.3+dfsg-2
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
SourcePackage: mono
Uname: Linux 2.6.31-14-generic i686
XsessionErrors: (polkit-gnome-authentication-agent-1:1898): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed