I respect the fact that you want answers to your questions and I think Trulia is a great tool for buyers and sellers to get "second" opinions. But I am concerned that you are this far into the process of purchasing a home and you don't know what is happening.
What is your agent telling you?
As you can see from the responses you received, the most important component to your relationship with your agent is communication. Contact your agent immediately and ask the question. If you don't get a response or answer that makes sense to you, contact the broker of that brokerage. Push until you get an answer.
As some of the other replies have said here, communications are the key and you need to be discussing this with your agent. If your agent is not providing you with answers or simply not responding at all, then you need to speak with the Managing Broker of the office your agent works with.
As for your question regarding your offer status we here can only provide our best council as to what might be a reason they have not responded.
First, if you signed a counter offer and you did so within the time frame required by the counter offer contract and it did not indicate the counter offer was in a multiple counter offer situation, then you have a fully executed contract; only your agent or their Broker can fully answer this for you.
Second, are you working with an agent? Are you working directly with the home seller or with an investor? It is advisable to work with a Realtor so you have an experienced professional representing you that fully understands the requirements regarding a home purchase.
I hope these replies provide you assistance. If you are not represented please feel free to contact me and I would be more than happy to consult with you regarding your home buying needs.
First thing is about escrow - in our area either the buyer opens escrow or uses one the seller has already opened. You also don't mention what "long" is, so it's hard to respond to that. There are many potential reasons, ask your agent/broker to find out what's going on.
Lance King/Owner-Managing Broker
I'm not sure how long it's taking the seller as your question doesn't state the time involved. Ask your Realtor the time frame for signature - it should be stated on the counter offer or purchase agreement.