It seems Quotetracker (QT) www.quotetracker.com has not been backfilling lately using TWS. I have sent them (QT) several questions and they don't seem to be able to figure it out. They are responsive but not very helpful (don't know what the problem is or don't know what to do). IB TWS is able to create realtime chart so it doesn't seem to be on their servers. I am only backfilliing 4 symbols. There is no throttling (*Backfilling .....) happening. Anybody experiencing similar problems?