Comment 2 for bug 663815

Can you please tell us what file extension the executable you used had and while filesystem is on you usb drive? There was a change in the default mount options for vfat that restricts executable permissions to windows executable files for the windows FAT file system a while ago:

udisks (1.0.1-2) unstable; urgency=low

  * Add 00git-vfat-showexec.patch: Enable the "showexec" vfat mount option, to
    avoid data files being executable (which causes confusing question dialogs
    in nautilus which only have one sensible answer). Patch taken from
    upstream git head. (LP: #14335)