hmm... i found the problem... i commented out a line of code... and have no idea why.

You can edit (as root) the /usr/bin/ext2chroot and uncomment the line that reads :
mount -o bind /var/tmp $CHROOT/var/tmp

Opening from browser or email saves to /var/tmp first and chroot cant see it unless that directory is symlinked.

I'll fix and release sometime soon but you can make the change mentioned above if you dont want to wait.