It could be your url rewriter, have you got advanced on?....if so then you might need to specify the actual url, not the humanfriendly veriosn, it all depends on how the re-writer works! Try this...
www.domani.com/Default.aspx?stg=4&tabid=107
or even
www.domani.com?stg=4&tabid=107
www.domani.com/Default.aspx?stg=4&tabid=107
or even
www.domani.com?stg=4&tabid=107