Subscribe2 just stopped working on a site I manage a couple months ago. After following this thread, I followed along and then sent myself a "preview" email. The email arrived just fine, but the following error was left on the page:
Warning: implode() [function.implode]: Invalid arguments passed in /home/content/xxx/html/wp-content/plugins/subscribe2/classes/class-s2-core.php on line 543
The site is hosted with GoDaddy, but I'm really hoping there's another solution out there than changing hosts. Ideas?