If a dialog window (ie "host not found" message) is openend while you
performe strokes with the mouse, galeon appears to hang. Klicking the
dialog buttos with the mouse has no effect. Somthing is grabbing the mouse
input... The only way to avoid killing X is to use the keyboard to close
the dialog.

I personally feel that a non-grabbing dialog, or even better: a HTML
message (like ie does, but with a better description of the problem) is the
way to go. The preferences dialog does not grabs focus, so why should a
host-not-found dialog do so?