It seems that the permissions for defined zones doesn't work correctly. The fe.protection.break.* seems "broken" a little bit. Some blocks can still be destroyed. In my case brick_stairs, bricks and stonebricks.

Here is a screen: https://abload.de/img/2017-07-11_12.47.26p6uxt.png

I used //fewand to define an area. Then i used the /zone command to name this area. Then used /p group ALL zone EnergyOutpost deny fe.protection.break.* fe.protection.place.* to protect it. And yes i used /p save and /p reload to force the permissions.

I have created a new Group called Members (from your example) and include the GUEST group in it. Could this cause this issue?

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