Chamando o fusion-icon pelo terminal ele é carregado sem problemas?
Chamei apareceu isso:
* Detected Session: gnome
* Searching for installed applications...
* NVIDIA on Xorg detected, exporting: __GL_YIELD=NOTHING
* Using the GTK Interface
* Starting Compiz
... executing: compiz.real --replace --sm-disable --ignore-desktop-hints ccp
Starting gtk-window-decorator
compiz.real (video) - Warn: No 8 bit GLX pixmap format, disabling YV12 image format
GConf backend: There is an unsupported value at path /apps/compiz/plugins/scale/allscreens/options/initiate_edge. Settings from this path won't be read. Try to remove that value so that operation can continue properly.
e agora, continua na mesma.