I am having the same problem, but can't figure out what I have wrong.
<p>Your Name (required)
[text* your-name] </p>
<p>Your Email (required)
[email* your-email] </p>
<p> Send to: [select choose-recipient "Membership|membership@ridgetop.org" "Waitlist|waitlist@ridgetop.org"]</p>
<p>Subject
[text your-subject] </p>
<p>Your Message
[textarea your-message] </p>
<p>[submit "Send"]</p>