I have a similar situation.
I have tested my Subscription page using an alternate e-mail address, and:
– it adds the e-mail address to Current Subscribers,
– it returns a message on the Subscription page of “Sorry, there seems to be an error on the server. Please try again later”,
– it doesn’t send an e-mail to the address for confirmation, +
– it doesn’t send notice of the subscription to my administrative e-mail address.
I expect that either:
– I don’t have it configured properly,
– there is a conflict w/ one of the other plugins, and/or
– GoDaddy is somehow blocking the last two steps, particularly as the message refers to the server.
Any suggestions?