In the latest versions of TWS there is a new setting in BookTrader called "Apply offset to parent trade price": http://img217.imageshack.us/img217/7518/01212011155731.png However, if you turn this feature on (in a trading button or a hotkey), change some other settings, and then enter an order, like this bracket order here: http://img263.imageshack.us/img263/6386/01212011154651.png you will no longer be able to modify child orders by dragging them with the mouse or with Alt+Arrow / Shift+Arrow keys. Is there any other new setting that I have missed or is it a bug? It seems that if, after upgrading from an older version, you never touch any other settings and only turn on "Apply offset to parent trade price", then there are no problems. For the problem to occur you need to turn "Apply offset ..." on, and then also change any other setting, like target or stop offset value. If it's a bug then how about if we start to complain by sending tickets to support. This has been reported on IB forums, but those forums are almost dead, it doesn't look like IB staff is paying much attention to them. --------- TWS 912.7, JRE 1.6.0_17, WinXP-SP3