When setting a window/dialog title to an empty string, Compiz changes it to
This goes against the GNOME interface guidelines, which state that alert dialogs
are supposed to have blank titles:
Of course a workaround is to use a string with a space, for example, but this is
far from ideal because most existing applications use empty strings as usual.
This was fixed some time ago. You need a version of libwnck that has
wnck_window_has_name, without that gwd can't properly determine if a window has
a name or not. If compiz is built agains a version of libwnck that has
wnck_window_has_name, it should work fine.