Created attachment 4858 sample leak the set background colour acts as a pass through and it leaks. I used FedUp to move from fc17 to fc18 I have the same problem with Xterm to lesser extend. Everything was ok in fc17 xfce 4.8.
do you use compositing? did you try to turn it off? execute xfwm4-tweaks-settings then go to the compositor tab and deactivate it. while using a compositor you can change the opacity of the window, simply hold the alt-key down and scroll up/down with the mouse over the notes window title.
(In reply to Mike Massonnet from comment #1) > hold the alt-key down and scroll up/down with the mouse over the notes > window title. By default, it causes zooming in XFCE. I love XFCE for that. The opacity does not change. When the composer is off, there is nothing to produce transparency. When the composer is on, Notes window is semi-transparent, but zooming prevents me from changing the opacity.
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