I'm evaluating QuantConnect and using the free version at the minute. I have created a backtest that works. About 50% of the time though, with the exact same code, a backtest won't complete properly.

All backtest consistently display the headline stats at the top. The ones that randomly fail though show these problems: 

  1. No charts are displayed, it just says “Waiting for chart”. 
  2. Orders list is not populated.

When this happens, I kick off another run and it usually works. If it doesn't, I'll try it for a third time and it'll work eventually. If I leave the tab open for a run that didn't work, it will never display the chart correctly or the orders list.

Am I doing something wrong? I really want to like QuantConnect but this isn't filling me full of confidence.

(I am a .Net software developer by trade)