Other things that were blocked are now not blocked. See below, the GIF ad at the top of the right column. There are many other examples.
In some cases, the new placeholders do show up. I preferred the collapsing content of beta 2, actually. I may have to to switch back to Safari for superior ad-blocking display. See these 3 examples, which looks cleanest?
Here's beta 2:
and beta 3. Look at that ad appearing for no reason:
and here's the page in Safari, using Safariblock:
