My experience is that Quotetracker tech support has been the best software support I have ever encountered, bar none. I have no connection to Medved or QT, other than being an appreciative user.

Quote from j_medved:
you do have to have data for the charts to work
If you run QT during market hours, it will store the data to show on the charts. If you use a datafeed that has backfill, you can right click on chart and select Backfill.... To configure the source for backfill if its other than the main quote source, go to OPTIONS/Data Sources menu, BACKFILL tab.
Which datafeed are you using?
Jerry Medved
http://www.quotetracker.com