Historical Data for Renko Bars

I have downloaded 6 months of historical tick data for EURUSD on DTN IQ Feed and I can see this quite clearly on a '100 tick' chart - From Jan 2012 to date (May 28th 2012)

On a renko chart for the same instrument the data goes back to 24th of April as the start date? do not understand this limitation?

Only segments (Jan-March / April-May) are available at any time? Is there some setting limitation?

Thanks

The specified data range cannot be plotted because the default limitation for the amount of bars in 32 bit version of MultiCharts is 5000000.

In 64 bit version there is no such limitation and the chart can be plotted properly.