When i follow the link http://stackexchange.com/newsletters/newsletter?site=meta.security.stackexchange.com the Oops! Something Bad Happened! with Panda Style opens.
I also tried the example newsletter of Android Enthusiats meta which has the same effect. The example newsletter of the main sites seem to work.
Note: I have no account on these sites.
Here are the steps to reproduce:
- Go to https://security.meta.stackexchange.com/questions/1446/should-blog-results-be-included-in-the-search-results?noredirect=1 (as an example)
- Upvote the question -> PopUp "Thanks for the Feedback" opens
- Click on see an example newsletter -> Panda