After I've updated from 2.1.7 to 3.0.1, Content Protection is not working properly in some cases.
Our sites have so many Content Protection using [member_only] tag.
See our site.
Those were working properly before upgrading, however once upgrade, all [member_only] tags don't work.
Then When I downgrade to 2.1.7, It works. (to downgrade means remove 3.0.1, then reinstall 2.1.7)
I've just upgraded. nothing I've done.
So this seems bug.
Please check this problem