Since the site update last night, I couldn't post replies, post journal comments, or even create a new thread to report the problem.
Now that I cleared my browser's cache, it's working fine.
To anyone experiencing the same problem (can't reply or post to anything): Clear your browser's cache.
(Note: I had to create a post to see whether the problem was resolved - And since you can't delete threads after creating them, this is the thread I created)
Edited by Servant of the Lord, 21 December 2012 - 03:39 PM.