Bug overview description.
This is something I noticed while investigating forum #203169. The blacklisted_tags cookie isn't cleared when you click the logout link.

What part(s) of the site page(s) are affected?
The Posts page and any other page showing things that can be blacklisted.

What is the expected behavior?
After manually logging out, nothing should be blacklisted.

What actual behavior is given instead?
After manually logging out but before ending the browser session, the blacklist remains.

Can you reproduce the bug every time?
Yes.

What steps did you take to replicate this bug?

• Log in.
• Put something common in your blacklist so something from Posts will be filtered.
• Log out by going to My Account > Logout.
• Go to Posts and see that your blacklist is still in effect.

Errors or other messages returned (if any).
None.

I can confirm this when I was on e6 a day ago. The blacklist was still there when I logged out.