Yesterday I made some changes to the way our strips are displayed on the website, RSS feed, and email. It seemed I got 2 out of 3 right, but broke the email. Do I feel a little stupid having sent out almost 11,000 emails with broken images? I do.
Anyway I am investigating the problem and will send out another try this morning.
As to why I made the change, all will be clear tomorrow.
Update: All fixed. Sorry for the double-emails.