One of the most annoying problems I encounter regularly with MailPress is the “Loading...” icon keeps spinning in the subscription form. Sometimes it spins before you've even done anything; other times it spins after form submission and never stops.
It's always some form of problem with the MailPress Javascript or CSS used to power the form. I recommend you apply the following changes to any new MailPress installation, so that you can save yourself the grief of having to deal with this annoying problem.
If you're applying my MailPress hacks, it'll be called “Processing...” instead of “Loading...”. Either way, the solution is the same.
Here are my solutions:
Enable MP_wp_enqueue_script
There is an option in MailPress that enqueues the problematic Javascript for generation at the bottom of the page. With recent versions of WordPress, this is pretty much always a good thing; but this option isn't the default yet … Continue reading…
Fix For “Loading...” Keeps Spinning In MailPress is a post from Build Your Own Blog