I'm using 2.13.6 of Eddie on Ubuntu 16.04 and noticed today that when I close the client (or as happened overnight it crashed) the IPTables firewall rules were reset, and all traffic was allowed!!
iptables rules restored when you close Eddie: intended and expected.
When Eddie crashes, we can't see how it can modify iptables rules or do anything else. Network Lock is a set of iptables and ip6tables rules, please feel free to clarify.
I'm running Mint 18.3 (or 18.2 and 18.1 and so on in the past) in a VM and as happens sometimes the Eddie GUI crashes, but openvpn is still running. I'll just reboot at this point.
When I rebooted in the past the network lock rules were still running because Eddie wasn't shut down properly.
But, I've noticed lately that network lock rules are not in place upon reboot.
Sounds like I'm seeing the same thing as the OP.