If TCE don't display the market, you are currently, on a planet with multiple markets/locations, please modify the Market, which is not displayed, by opening the Market Database panel, select Modify and thereafter the market from the dropdown list. Check now, if the stored Market coordinates fits with the actual coordinates. If they are different, select the actual coordinates as the market coordinates and save the market. Thereafter TCE should detect the market.
Morning Eventure
For me, even following this, TCE is still not detecting the market after manualling forcing in the coordinates, even with short shuttle runs between two different planets. Is the 'range' on the coordinates to small, as each time I manually update, it's only the last couple of digits of the coordinates that changes each visit?