MarketData.GetSeries() doesnt work with backtesting

I have been trying to find a workaround for this issue for almost a week and its a critical part of my trading model so need a resolution.

The issue is very simple - var series = MarketData.GetSeries(TimeFrame.Daily); works fine when running a cBot normally, however in backtesting it just returns NaN for every value no matter what I do - ie trying any different TimeFrames still doesnt work.

I have seen in a post on spotware here this has been an issue for many, many years - and in 2013 someone from Spotware seemed to indicate they were not only aware of this issue, but that it was something they "always planned to do and hope to achieve that soon" - well its 2018 so I am really hoping that falls into the soon category.

If anyone has a fix/resolution for this in backtesting or if anyone at spotware can offer any new insight into this issue - that would be greatly appriciated before I bite the bullet and jump platforms.