I've just changed the web animation on several items from "scroll in from right" to "zoom / fade in".

The new animation does not appear in either preview mode or in the published website. I've cleared my cache, changed browsers and even rebooted my laptop.

Any ideas on what's going on?

Also, is there a way to change the preview browser quickly?
It seems that the only way is to change my default browser. In older versions you could click on a button of the built in browser.