If it's when starting a new thread, I think that problem's been around for a while, hasn't it? There are two different ways to post a new thread:
1) Just above the pinned threads, there's your avatar, and a text box that says "Thread title", or
2) A little bit above that and to the right, there's an orange "Post new thread" button
The problem always used to occur for people using method 1, I think, if you use method 2 it shouldn't be a problem.
If it's replies to an existing thread that are the problem, then that may be a new issue. Not been having any problems myself.