The problem is not with your browser or mail service. You have been sent the text format news letter (which is not being drafted at the moment) and not the HTML one.
Some people are getting the HTML newsletter and others getting text one.
We are checking the error. And will let you know ASAP.
Also, i think some people configure their Mail Service to accept only Text based mails - they disable HTML - so better the members also check their mail settings in General Preferences.