Sometimes (I have not been able to determine under what conditions), when loading a strategy from file and editing it, the filename mysteriously gets lost and 'New' appears as the strategy name (next to the "Run quick backtest" button above the rules list), when in fact, a full strategy was loaded from file.
I know this is a tough one since it is not easily reproduceable, but it has happened to me 3 times recently, so I'm reporting it.