Comment 16 for bug 363038

The remaining system showing the USB problem is the Dell Latitude XT.

A google search does turn up references to others reporting that this hardware has problems with USB devices plugged in at boot time (presumably on Windows):
http://www.gottabemobile.com/forum/forum_posts.asp?TID=6595&PID=45284&SID=3a2zz67cfbfdf45b73b86987ab1d5c1e#45284

Though that could be entirely unrelated.