I have now confirmed what the problem is. Your home's listing is listed on our site as "off market" because we are not being provided with any information regarding this listing.
Listings must first be submitted to Trulia with the active information before they can appear on our site as "active".
The best course of action is for you to contact you listing agent, and refer them to this page: http://www.trulia.com/submit_listings/ . Please be sure to ask your agent why your home was not posted on Trulia initially as you had expected.
Let me know if there's anything else I can help you with,
Community Manager, Trulia Voices