Live system create: "There has been critical changes in the file system during this operation"

I am getting the above error every time I try to have Systemback write an .sblive image to a USB drive. Seeing other questions with the same issue, I ran `/usr/lib/systemback/sbsustart systemback` and received no errors. Here is the output. The error does no show up in terminal -- just in the GUI.

`mke2fs 1.42.12 (29-Aug-2014)
/dev/sdc2 contains a ext2 file system labelled 'SBROOT'
 created on Sun Jan 3 14:30:03 2016
Creating filesystem with 7790472 4k blocks and 1949696 inodes
Filesystem UUID: 55e6f8f3-ad71-438a-95ee-24teteg1128b
Superblock backups stored on blocks:
 32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
 4096000

Allocating group tables: done
Writing inode tables: done
Writing superblocks and filesystem accounting information: done `

Also, and this is weird, running Systemback appears to have somehow changed my dconf entry for `org>gnome>desktop>input-source` from empty to ['xkb','US']. No idea why that would happen -- maybe it was another process.

Any ideas what is going on with the Live System create?