Quote from atrocious:
Hi Tradator -
Yes, I'm using IB. What you're referring to is just a data limitation, IB only transmits one deep in futures spreads (one of my other brokers gives me 10 deep in calendars - IB used to a year ago). Post an ES straddle order that matches the bid/ask or betters it and you'll see it.
On the other hand do the same in a vertical spread and you won't ever see your order which is archaic, and even worse, I'm 99% certain it will only fill on the implied quote even if a better quote is available in the spread book.