matplotlib on osx problem

Hi everyone,

I'm not quite sure what to call my problem so searching for it is difficult, but I'll try and describe it the best I can:

Matplotlib in python on OSX seems to have an issue with the pan/zoom tool. When I click it and drag the plot around, it does not update until I release the mouse. I've used this function on other *nix machines and it seems to be fine. Here's a quick video describing what I mean if my description is unclear:

I have tried to switch the backend to osx in the matplotlibrc file, but the result is the same. Any help you can provide would be greatly appreciated. Thanks!