That's bizarre and slightly worrying. Could you press F12 to open the developer console and see if there's any obvious errors? I don't use getParameter directly in my code so it's probably an Engine bug.
The pink screen on Chrome is something that's happened to a friend before, please try to reload a bunch of times / restart your browser.
If all else fails, you can always try it on phone/tablet (same URL) but the controls are harder to use.