I think i messed up my simulator data?

[ohowie]

this may be related.
1/24/2008 7:37StrategyError on calling 'OnBarUpdate' method for strategy 'LL': Object reference not set to an instance of an object.

[NinjaTrader_Dierk]

The problem likely is different. A simple strategy holding only (!) this code line

DrawTextFixed("U1",Math.Round(Position.GetProfitLoss(Close [0] ,PerformanceUnit.Currency)).ToString(),TextPosition.TopRight);

works no problem.

I suggest isolating the issue in your strategy further.