Hi gocool
Post the result of:
cat /usr/local/share/applications/avidemux.desktop
Also, if you click on the desktop, go to Applications->avidmux and click on that, does it start?
[Desktop Entry]
Categories=GTK;AudioVideo
Comment=Per editar els vostres vídeos
Comment[ca]=Per editar els vostres vídeos
Exec=/apps/avidemux/bin/avidemux2_gtk
GenericName=Video Editor (GTK+)
GenericName[ca]=Editor de vídeo (GTK+)
Icon=avidemux
X-FullPathIcon=/apps/avidemux/share/pixmaps/avidemux.png
MimeType=application/x-shockwave-flash;video/flv;video/mpeg;video/x-mpeg
Name=avidemux
Name[ca]=Avidemux (GTK+)
StartupNotify=true
Terminal=false
TerminalOptions=
TryExec=/apps/avidemux/bin/avidemux2_gtk
Type=Application
X-DCOP-ServiceType=
X-KDE-SubstituteUID=false
X-KDE-Username=