For some reason my Ipython notebook widgets stopped working after I upgraded to pandas 0.16 (seems unrelated but thought I'd mention it). I'd love to post a screenshot but StackOverflow won't let me because I'm new and don't have enough "reputation" apparently. I'm trying this basic code, and as you can see from the screenshot the dropdown menu, nor the radio button values populate the widgets. I'm running the notebook in Python 2 mode. Is this a known issue?!
from IPython.html.widgets import interact, interactive, fixed
from IPython.html import widgets
from IPython.display import clear_output, display, HTML
temp_w = widgets.Dropdown(values={'1':1, '2':2})
display(temp_w)
mysecondwidget = widgets.RadioButtons(values=["Item A", "Item B", "Item C"])
display(mysecondwidget)