I'm using matplotlib 2.0.0 installed via anaconda with ipython 4.2.0 on mac os x 10.9.5. Since upgrading to matplotlib 2.0.0, whenever I start a matplotlib-enabled session (e.g., ipython --matplotlib) or a new window is created, it steals focus from the OS. I'm using the TkAgg backend, though the same thing happens with Qt5.

This is particularly a problem for some test codes that create a large number of windows while running; I effectively cannot access the OS at all when the tests are running, even the terminal, so I can't kill the thread.

Any suggestions on what might have happened with this latest upgrade? Since this was anaconda-installed, I can't rule out a change in the backends rather than with matplotlib, but I think the relevant expertise is likelier to be here.