Cairo Dock crashes on switching desktop workspaces

[Schlueri]

Hi List, 

i've tried cairo dock, nice piece of software. 

All works fine till i switch the desktop workspace. Cairo Dock
disappears and a "Maintenance Mode" Window (the configuration dialog) is
shown. 

After starting from terminal, i get some error messages. 

Any ideas where the problem is?

Thx & greetz
Dirk

$ cairo-dock
warning :
(cairo-dock-application-factory.c:cairo_dock_create_surface_from_xpixmap:120)  
  This pixmap is undefined. It can happen for exemple for a window that
is in a minimized state when the dock is launching.
_cd_find_volume_name_from_drive_name: assertion `pDrive != NULL' failed
warning :  (cairo-dock.c:_cairo_dock_intercept_signal:270)  
  Attention : Cairo-Dock has crashed (sig 11).
It will be restarted now.
Feel free to report this bug on cairo-dock.org to help improving the
dock !
gtk_combo_box_new_with_model: assertion `GTK_IS_TREE_MODEL (model)'
failed
gtk_cell_layout_pack_start: assertion `GTK_IS_CELL_LAYOUT (cell_layout)'
failed
gtk_cell_layout_set_attributes: assertion `GTK_IS_CELL_LAYOUT
(cell_layout)' failed
invalid (NULL) pointer instance
g_signal_connect_data: assertion `G_TYPE_CHECK_INSTANCE (instance)'
failed
gtk_tree_model_foreach: assertion `GTK_IS_TREE_MODEL (model)' failed
gtk_box_pack_start: assertion `GTK_IS_WIDGET (child)' failed
gtk_combo_box_new_with_model: assertion `GTK_IS_TREE_MODEL (model)'
failed
gtk_cell_layout_pack_start: assertion `GTK_IS_CELL_LAYOUT (cell_layout)'
failed
gtk_cell_layout_set_attributes: assertion `GTK_IS_CELL_LAYOUT
(cell_layout)' failed
invalid (NULL) pointer instance
g_signal_connect_data: assertion `G_TYPE_CHECK_INSTANCE (instance)'
failed
gtk_tree_model_foreach: assertion `GTK_IS_TREE_MODEL (model)' failed
gtk_box_pack_start: assertion `GTK_IS_WIDGET (child)' failed
warning :
(cairo-dock-application-factory.c:cairo_dock_create_surface_from_xpixmap:120)  
  This pixmap is undefined. It can happen for exemple for a window that
is in a minimized state when the dock is launching.
_cd_find_volume_name_from_drive_name: assertion `pDrive != NULL' failed
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