Yes, correct Trevor.
Every thread & reply must have a title. When you are preparing a reply to a thread on this website, the computer tries to automatically carry forward the thread's title to your new post for you. Unfortunately, double quotes (and other characters) in the title confuse the computer into trying to carry forward an empty title and so your reply is rejected.
Other than webmonkeyAsh sorting this out, the best solution to this for us is to not use quotation markers in titles of new threads. As the problem doesn't crop up too often, I think it's hardly worth anyone fiddling with computer code.
JimC