I tested on a trusty box, with usb-creator-{common,gtk} 0.2.56.3 I can erase the ntfs usbstick without popup error.
However there is one thing to mention, after the erasing it prompt "There is not enough free space for this image" and the "Make Startup Disk" button is inactivated. After another erasing now the button is activated and I can burn the ISO image successfully.
Anyway I think the issue is properly fixed, I'll update the tags for trusty.
I tested on a trusty box, with usb-creator- {common, gtk} 0.2.56.3 I can erase the ntfs usbstick without popup error.
However there is one thing to mention, after the erasing it prompt "There is not enough free space for this image" and the "Make Startup Disk" button is inactivated. After another erasing now the button is activated and I can burn the ISO image successfully.
Anyway I think the issue is properly fixed, I'll update the tags for trusty.