I am currently encountering a posting problem when replying to my thread. I had this problem on one of my forums and one of the other admins managed to fix it. Can't remember what caused it or how he fixed it, was quite a long time ago.
TL;DR: I have put over the required amount of digits however i still can't post.
Lol, if you actually read it, it's saying the subject is too long, take some characters out of the subject before you post a reply I got that on your thread too.
On his sniping forum thread, the subject when 're:' is added it's too long for a subject so it glitches when you reply, quote someone then backspace the subject