Content Protection is not working properly in some cases.

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.
http://87seru.com/me/

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