Authorization code mismatch

[Joshua Mayer]

If you get an Authorization code mismatch error, please do the following to correct the issue:

Make sure you've ran the "Find Updated Templates" via the ACP Templates area. You'll need to update headerinclude, index_boardstats and forumdisplay_threadlist with the changes made them in.

This is to prevent a CSRF vulnerability.

If you have "mark all forums read" links anywhere else, simply add the following:

misc.php?action=markread&my_post_key={$mybb->post_code}

I have seen multiple people asking how to fix this issue, so hopefully people see the sticky.