After several years of Working with WP and was quite happy with what I had going on several web sites, I upgraded to 3.9 and found that a couple of plugins were misbehaving and/or nonfunctioning. Haha! I was forced to use my brain and find a work-around. No problem. (Thinking is a good thing, right?) The new WP is very responsive and there are a lot of young, brilliant minds developing Themes and Plugins that are quite wonderful. Many of my older Plugins were built years ago and the authors of those had long abandoned their updates. I applaud everyone on the WP Team as well as those of us who embrace it! It's not perfect but it's beautiful!