I am a moderator and administrator and want to access the control panel for a thread to make sure that none of its settings had been modified, which might be preventing a user from posting to it all of a sudden. Where is the thread control panel located? Thanks.
Thanks, Brogan. If there's nothing listed under there, I assume that means there are no reply bans for the thread? Any other reason you can think of why one specific user would be unable to post a two paragraph reply to a thread (fewer than 400 words) but could post it as two separate posts of one paragraph each? Everyone else can reply to the thread without issue.
That sounds like a web server error, so probably something along the lines of mod_security. Your host should be able to identify specifically what error is being caused by that request and likely resolve it by whitelisting that rule for your site.