I don't know if it will be an issue, but it's impossible to see the bounds of the progress bar when using IE. It looks just fine on the profile page and on this page when you mouse over, though.

![2013-08-21-093424_250x135_scrot](https://f.cloud.github.com/assets/3379265/1001298/8a5641a6-0a66-11e3-8492-e3cf53c53873.png)

This is a 60% progress bar.

Tested in IE8 and 10.