The blocked calls occurred when I pressed the up-vote button. I get similar blocked calls in Chrome when I try to add an image to a question or answer on a meta channel.
It's only a problem on the meta channel. The main sites are fine.
I had to post this from...shudder...Safari to attach the image to the post. :)
Edit: this is possibly a problem for me because I visit all Stack Exchange sites via their https URLs and the meta sites have invalid certificates. This is what I get trying to use https://apple.meta.stackexchange.com/ from Chrome:
If I come to the site via the non-encrypted endpoint it works fine in Chrome. Chrome really doesn't like when your site mixes https and http requests to its own domain (and rightly so).