Just happened now while watching the Colts-Jets game (go for the upset Jets!) and noticed the quick reply option has the text box at the bottom of the thread, but no 'submit' button, so effectively removing the option. Now you must use 'Add a reply' instead.
Not a big deal, but annoying with the slow to loading forum to reload another page.
When I hold my mouse over the button, it changes into the 'hand' cursor. If it doesn't do that, there must be some real issue, as in it's not there at all, not just invisible. One suggestion. If you have noscript, you might temporarily allow tomshardware. Noscript often breaks buttons.
Well, why look at them when I never click on them anyway? I guess I could allow a couple, but some of the adds they find are extremely annoying. But seriously, I could probably count on my fingers the number of times I have purposely clicked on an in-site add. Except for their price-grabber engine. Thats pretty nice, I hope they get add revenue from it, and it's not blocked by add-block.