title: Kernel loading forever in jupyter notebook
body: <p>I'm using OSX Yosemite.</p>
  
  <p>I've update ipython via conda and turns out notebook also has updated version, which I'm very excited to try this.The notebook has been converted into jupyter.</p>
  
  <p>I'm using python 2.X, and already have existing .ipynb files. When I open it, new window appears but there's blank and nothing. I can create first cell there, but I already have my notebook. And the kernel also loading forever. There isn't any error log in the console. What do I have to do? Please help!</p>