Displaying windows that should be hidden

[Johan Ingvast <ingvast md kth se>]

Hi
I recently installed the trial version of varicad and found that it does 
not work in my version of sawfish.
The symptons are that windows that should be hidden are displayed empty 
(above the main window).
I don't have this problem if I run Xfce4 instead.

Any clues?
Is this a sawfish matter or something that I should contact varicad about?

My sawfish version 1.3

/johan