If you do not see your order displayed in the NBBO or the Market Depth window, check your order parameters on the Pending orders page of TWS. If you submitted the order as a Hidden or Iceberg order, then some or all of your order will not be resting at an exchange and therefore will not be present in the Market Depth window or NBBO. In addition, it is possible that your order may be in a "Saved" or "Paused" state and must be transmitted to an exchange.
If you are trading Pink/OTC stocks, they must meet the Minimum Quote Sizes and will not be routed to an OTC Market Center unless marketable. Also, IBKR simulates option spread bid/ask markets so they also will not show in any option exchanges' Complex Order Book.