Sometimes files in .config/xfce4 just disappear if the hdd loses power. I suspect that the way xfce works with configuration files is not really safe, that is xfce just directly writes into a file instead of creating a file with a random name and then moving it over the old one. This becomes important if the hdd loses power (which happens on laptops quite often), although I am not entirely sure this is the case. I had this experience recently, when my xfce4-panel lost half of the panel *.rc files.
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