If it works for you in one browser but not others, then you've got your answer.

As I say regularly to these kinds of threads -- we rarely make changes to our servers or templates, and when we do, dozens or hundreds of people are affected (and let us know when something is wrong).

When it's a one-off problem of this nature, it means something wonky is going on with your web browser, or a plugin or firewall protection that stops animated GIFs for instance.

DocJohn