In this post I pointed out a problem I was having with backfill from Sierrachart: http://www.elitetrader.com/vb/showthread.php?s=&postid=747399#post747399 The problem is that I am at GMT+10 (Australia) and this is after the time of the two exchanges I download data from .... Globex in Chicago and HKFE in Hong Kong. When my computer clock is set to GMT+10 the backfill sometimes works. And sometimes it does not. More information is provided at: http://www.sierrachart.com/discus/messages/2/3321.html?1116244875, and earlier at http://www.sierrachart.com/discus/messages/2/3259.html?1116098775 Jerry Medved made some suggestions and didnt believe that the problem applied with Quotetracker. The Sierra team didnt think that the suggestions applied to the problem I was experiencing and asked me if QT was free of the problem. So I downloaded QT and figured how to make it work with my two futures contract. Tonight I have confirmed that the problem applies to both Quotetracker and Sierrachart. At various times of the day, if your computer clock (and IB TWS) are set to GMT+10 then QT and SC can not download backfill data. By contrast if I change the time to EST both can download backfill data. Can someone at IB please comment on this?