Hi,
Same problem here. This morning I had a power failure. After work this afternoon, powered up my gateway, no connection to Internet.
The firewall failed to start.
My kernel is those updated on 6 july: 3.10.0-327.22.2.v7.x86_64
When I start manually the firewall it never finish loading, I've to "break it" via CTRL+C, but if I do a iptables -nvL, it is working.
If I: systemctl status firewall it says that it has failed.

So please continue to investigate.