I kept getting: Firewall Status: Enabled but Stopped in my CSF in cPanel. I am currently running WHM 11.40.1 (build 11) and csf v7.03.
I tried just clicking start, no luck it would just flip back a few minutes later. So I ended up dropping to shell and running
service csf stop
service csf start
that seemed to work, there must have been a hung iptables rule, or a bad rule that caused CSF to flip to disabled.