Okay, I've found something I can't seem to figure out.
Adding newsletter recipients on my test server? No problems.
Adding newsletter recipients on the live, deployed site? Fails.
The interface shows the green "User added" message, but they never appear in the database - somewhere between submission and database insertion it's failing, but there's no easy path to find out where it's broken.
I'm at a bit of a loss. Any ideas?
Also, although not necessarily the issue, I have noticed a JavaScript bug in cms/javascript/MemberList.js on line 56:
$('Form_MemberForm').loadNewPage(response.responseText);
In both IE and Firefox, "$('Form_MemberForm')" is a non-existant object and which produces a JavaScript error in the browser.