I should have prefaced, on a Linux system, I was able to get it to work.
I can only tell the steps that worked for me:
my media was mounted at /mnt/sdg1.
replace sdg1 below with your media's "name"
issue: following commands from a terminal. you may need to be root depending on system, or
possibly use sudo before each command.
#if /media/sdg1 does not exist issue this:
mkdir /media/sdg1
#then issue the following commands
umount /mnt/sdg1
mount /dev/sdg1 /media/sdg1
then after clicking on slice, when it finishes slicking, the button should say "save to removeable media"
unless you have selected usb, then use the dropdown to the right of the button to choose "save to removeable media"