Sure ya can, shouldn't be anything locked. I think Matt did set up some new kinda deal there, he'll have to explain that.
I just went and looked and can see why you might then they are locked. Are you seeing a white overlay with times and such on it?
You can ignore it and just click on a thread or begin a new one. I'll have to talk to Matt about what the heck that white overlay thing is. For some reason he thinks he needs to offer us old farts new stuff none of us understand or want.