The problem is your browser. Chrome and FF (and maybe others) can't auto switch, so if the program was opened with the integrated card, then that's all you can use. If it was started with the dedicated card, then only that will work. If you start the browser with the dedicated card activated then switch to the integrated, you'll see those lines until you either switch back to the dedicated card or quit/re-open with the integrated.
Also, when I say "started", I mean the program was fully closed (no light under the icon) and then opened. Simply clicking the red X won't work.