We believe that your issue has been closed by the upload of
Version 0.3.1 of grml-desktop from Michael Prokop <mika@grml.org>.
The explanation is attached below

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Hash: SHA1

Format: 1.8
Date: Thu, 25 Nov 2010 10:44:29 +0100
Source: grml-desktop
Binary: grml-desktop
Architecture: source all
Version: 0.3.1
Distribution: unstable
Urgency: low
Maintainer: Michael Prokop <mika@grml.org>
Changed-By: Michael Prokop <mika@grml.org>
Description: 
 grml-desktop - configuration files for the X desktop at grml
Changes: 
 grml-desktop (0.3.1) unstable; urgency=low
 .
   * [4ab7464] execute irssi via x-terminal-emulator. [Closes: issue931]
     Thanks to Jens Kubieziel for the bugreport.
Checksums-Sha1: 
 1cc657d6de6b0c9fe619a53ca55aecf00b6bbc0f 866 grml-desktop_0.3.1.dsc
 b86e35c572953072447cf3856e87d568e9e0c994 436944 grml-desktop_0.3.1.tar.gz
 e23f46662ee4147a970c33052bd6b62bf73f8851 446314 grml-desktop_0.3.1_all.deb
Checksums-Sha256: 
 5a3553d4f5e5beb6f16ec1ab9f5329fcdab921e6ae32c6655551c658070744b9 866 grml-desktop_0.3.1.dsc
 dae38757ec74b379c808b79c5371a963c5f97c6083f88494073a0065363fc946 436944 grml-desktop_0.3.1.tar.gz
 b1b8f271a4d5161281c06bb08f2f44565bbaf774faa0d22f2ace4f5a3e145b33 446314 grml-desktop_0.3.1_all.deb
Files: 
 2d3228277fce35137925590cf1fb9a26 866 grml extra grml-desktop_0.3.1.dsc
 af27cb848f0b7a968c0cb2d17286254d 436944 grml extra grml-desktop_0.3.1.tar.gz
 82880830c38587fc2f18773b99506be2 446314 grml extra grml-desktop_0.3.1_all.deb

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Fixed in git.

The window manager wm-ng has several icons on its desktop. One suggests that a
click opens a xterm and connects to the grml IRC channel. However if you click
on this icon nothing happens. But if I open a xterm and run grml-exec-wrapper 
irssi (command behind the icon) everything works as expected. I found this while
running grml 2010.04.