This appears to be a threading issue.  It occurrs when trying to display the 
progressbar, failue or success dialogs. to recreate do:
1. Go to a terminal window or use alt-f2 to run a command.
2. Type "sudo usb-creator-gtk"
3.  Select appropriate input and output devices.
4.  Start the process.

At some point it should lock up.  Note that this also happens in Karmic
with usb-creator-0.2.7.  Also note that it only happens with assistive
technology enabled and orca running.  Also note that since orca does not
normally run for things selected from the admin menu usb-creator should
work from there.

It appears to be occurring because of using separate threads to dispaly
the above items.  Maybe try rearranging the code so that we put the
actual work on a separate thread and leave all display stuff on the main
thread?

-- 
[lucid] Impossible make USB startup disk with usb-creator-gtk application, now 
usb-creator-gtk is unuseable my system
https://bugs.launchpad.net/bugs/553811
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