Arduino on Ubuntu 14.04

I’ve installed Arduino on Ubuntu 14.04 via the software center. I’ve also tried via apt-get. The install works fine, but when I open the app it looks a little funky. When I open the example files they look like gibberish (see the attachment).

Any suggestions on how to resolve this?

Sometimes if I expand the screen it clears up, but then if I move the window, or re-size it turns to gibberish again.

Thanks.