If you are using Chrome and you are seeing an issue where the bottom-left part of your screen is showing as transparent or white, this is a current bug with Chrome 41 (the current "latest" version). They have fixed the issue in Chrome 42, which will be out in a few weeks. If you don't want to wait until then to fix the issue, you can update to the Chrome Beta version now: <a href="http://www.chromium.org/getting-involved/dev-chann" rel="nofollow">http://www.chromium.org/getting-involved/dev-chann</a>... , or you can temporarily use Firefox. Sorry for the trouble! Here's an example of what this bug looks like: