Applies to version 4.x - in version 5 the problem no longer exists.
If the Cumulative Volume indicator has been added to the chart but the data does not appear in the window check if the market on the instrument is currently open. If not (e.g. at the weekend or overnight) then wait until the market is open or download and run the MT4Ticker programme. The link to MT4Ticker can be found on our website Useful programmes.