Error message references non-existant "No to all" button

I tried to create a bootable USB stick with too little space, and so got this error message. I wanted to click "No to all" but there was no such button. "Yes" appeared to have had the desired effect (of making the error go away and unetbootin stop trying).

Steps to reproduce:
1) Get a too-small USB stick
2) Try to turn it into a bootable USB stick
3) Wait for it to fill up, watch error message appear

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: unetbootin 575-1
ProcVersionSignature: Ubuntu 3.5.0-17.27-generic 3.5.5
Uname: Linux 3.5.0-17-generic x86_64
ApportVersion: 2.6.1-0ubuntu1
Architecture: amd64
Date: Mon Oct 8 22:49:11 2012
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Alpha amd64 (20120910)
SourcePackage: unetbootin
UpgradeStatus: No upgrade log present (probably fresh install)