This seems to be bug #107320, with different symptom.
Looks like XFCE is not resetting DPI like others Desktops.
Are you able to attach /var/log/Xorg.0.log file to this report?
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: Confirmed => Incomplete
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[gutsy] desktop i386 tribe-3 normal icons very big font size
https://bugs.launchpad.net/bugs/127827
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