I'm using VisualSMA successfully, representing an 8 range SMA on a 6 range chart...
However, I want to use the same settings in a strategy to tell me if price is close to the SMA.
I'm using the following code:

VisualSMA(50, false, true, VisualSMACalcMode.Strategy, VisualSMAPeriodType.Range, 8, VisualSMAPriceType.Close).MTF_SMA[0]

To test the code, I used it in a strategy to draw dots.
It works for all available bar types EXCEPT Range..

Any ideas would be greatly appreciated.
Thank you all in advance..

To comment on your findings, I would need to test the strategy.

There are limitations that apply to range bars, because a range bar is only closed after the first tick of the next bar has been detected. We have discussed the issue here:

Coding Multi Time Frame (MTF) Indicators with NinjaTrader I have made some tests with various multi-timeframe indicators, how they behave when they are called from other indicators or strategies. Let us consider three different cases: (1) You have a multi-timeframe indicator which loads minute bars. (2) You …

Please download the access indicator and check whether it behaves in a similar way as your strategy.