When trying to send a newsletter with manual send rate, the emails are not being sent. These are the steps I followed:
1. Create a template.
2. Create a list using that template with 'Manual' send rate.
3. Add subscribers (Mass) to that list.
4. Click 'send' under the 'Operations' column of the 'Create/Send' tab.
5. Run cron.
6. Under the 'Statistics' tab, it shows a timestamp for 'Last sent' but the value of 'Emails sent' is 0.
Note that when I 'create and send a custom newsletter', the emails are sent correctly to subscribers of the list. Thanks for investigating!