EDIT: Updated the thread title to more accurately describe the problem at hand. Used to be "Security check failed after successful captcha".
EDIT 2: Resolved as per this thread.
Pretty much what the title says. Whenever I try to update a dispatch, I get sent to the captcha screen, and upon successfully completing it, I still get a message saying "This request failed a security check" and the edit doesn't go through. I'm also getting this on one other puppet (Khorzromoth), but not any others. This doesn't apply to mobile, though being relegated to solely updating my dispatches on mobile is extremely annoying, especially given the fancy formatting I tend to employ. Clearing my cache hasn't worked, neither has relogging, and at this point I'm getting kind of desperate to be able to update my factbooks again.