I'm a SierraChart & IB user. I noticed a problem with backfill when I upgraded last month and downgraded on the basis that IB might fix it. The problem was that the timestamps on backfill bars had changed and the 30 second bars were marked as being 30 seconds later than they had been previously. So backfill data no longer lines up with live data. I went back to 872.6 but this week I've tried 874.3 and its got the same problem. I have compared 872.6 java 511 api 9.20 with 874.4 and 873.3 using the same java and api. The 872.6 backfill lines up perfectly with real time data. The 874.4 backfill is 30 seconds out on 30 second backfill bars and 5 seconds out on 5 second backfill bars. With 874.4 the bars are labelled respectively 30 seconds and 5 seconds later than they are on 872.6. I've asked SC to compare the labeling on the bars but my question is: are other people experiencing the same problem. What about ensign ib backfill? What about quotetracker backfill?