I use google webfonts frequently with my website projects but I'm having a peculiar issue that I'm not sure how to cure.
On all of my browsers (FF,Chrome and Safari on OS X 10.8.2) the Open Sans regular font weight (400) is displaying as semi-bold. Here is an example of it even happening on google's webfont library: http://i.imgur.com/sZtWW.png
To make sure it's an issue on my end, I loaded up the page in browserstack. In the browserstack instance it displayed the correct font weight (Chrome 23 on Win 7).
Does anyone have any idea what the problem is?