I researched the problem and found the bug (and a fix):

In gwmh.h, line 198: change the definition of frame_width and frame_height to be guint16 !!!

Probably a good idea to do it on line 201: for win_width and win_height.
 
Note that on lines 1409, 1410  ---- task->frame_height = height

We set a gint16 to guint16 and thus get a negative number!!!   This propagates and crashes
the desk-guide applet.

-- 
John Moore
Firetalk Communications
jmoore@firetalk.com