A minor problem I'm having right now is that the big red error messages you get when there are exceptions (several of them stacking non-stop if your code is resilient enough) can block you from terminating the backtest causing these, on Chrome anyway. I had to minimize site text size with scroll wheel to be able to access backtest list button and deletion functionality thereunder fast enough, before new error messages stacked up on top.

Like I said, really minor issue, but should probably be looked at at some point. Not sure if it qualifies as support ticket given that I'm working around it successfully.