Not sure it qualifies as a bug, but I thought it was worth mentioning. There's a problem with long reviews. Not hugely long ones, either, but reviews of 250+ words. They appear on the site just fine, but the author can't reply. The 'author response' window pops up and there is no way to scroll down the whole review in order to reach the reply area. On a related note, it would be interesting to know whether or not there's a limited wordcount for reviewers.