eNewsletter doesn't send on new server

I moved my site from one server to another using the "Snapshot" plugin. All of my mailing lists look right. But when I go to "send", I check the mailing lists to send to (there are about 5 separate lists that I need to send to. And whether I choose to send immediately or via cron, the check boxes uncheck one by one and the message does not send.

If I send test messages, they come through. But I DO NOT get the normal page where it shows messages "sending" when I try to send to the list.

Any ideas?

Thanks.

Danita