I have just installed Ubuntu on a Dell Inspiron 15. I'm using an AMD Radeon HD 7730M with the latest beta drivers installed. Whenever I try to plug in a dual monitor I get incredibly bad screen flicker and my launch bar is displayed in the middle of my screen, but still responds as if it were on the left at it's normal position. See this image.
Any idea what's causing this? Could it be the beta drivers? Have I not set something up correctly?