Can't subscribe to a thread I created

[4slam]

After creating a new thread, when I click on the thread's 'Subscribe to this thread' button, I get a page showing the following error:

Authorization code mismatch. Are you accessing this function correctly? Please go back and try again.

Secondly, I didn't get subscribed to this thread even though I selected 'Subscribe and receive emails...' before submitting the post.

[snippsat]

Hi thanks for feedback.

I have removed Subscribe to this thread Button for now in Thread header display.
Now it's in original place MyBB in bottom of Thread same text(Subscribe to this thread),and there dos it work.

Shall look at it later when i have time,the button was added in Thread header for easier access,
but something has happen so it did not work anymore.