Please try removing all partitions on the key using gparted, then run
usb-creator on that disk.
Does this resolve the problem?
If not please upload ~/.usbcreator.log and run the following command:
$ apport-collect 486754
** Changed in: usb-creator (Ubuntu)
Status: New => Incomplete
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Usb not recognized after using usb-creator
https://bugs.launchpad.net/bugs/486754
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