Previous versions of CQG IC and QTrader cleared daily market values, such as open, high, low, and close from quote displays and the daily value for a chart when a particular market closed and was in the pre-open state. Now, they are cleared at the “Trade Clear” - 15 minutes before the open of the first trading session (generally, in the evening). This change applies to a limited set of commodities including ZSE, ZWA, ZLE, ZME, HE, GLE.
Read more from the Help file.