<a href="https://www.vbulletin.com/forum/showthread.php?350975-Invalid-Security-Token-Error-on-Mark-Forums-Read" target="_blank">https://www.vbulletin.com/forum/show...rk-Forums-Read</a>
Basically 3.8.5 added a required security token to mark all forums read so people couldn't be 'tricked' into doing it by malicious users, as a result templates either need to be reverted or can be manually updated with the code in that thread.
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