AWR1642BOOST: Issue with the range doppler heat map from the lab 4 obstacle detection

I am having an issue getting any data from the Range-Doppler Heat Map when using the obstacle detection demo. I have changed the guiMonitor line in the configuration file appropriately to get a range doppler heat map. I am using the getRangeDopplerHeatMap function that is provided in the MATLAB code.

Here is the section of code that I call the function and try to plot the heatmap:

[rangeDoppler, byteVecIdx] = getRangeDopplerHeatMap(bytevec_cp, ...
                            byteVecIdx, ...
                            Params.dataPath.numRangeBins, ...
                            Params.dataPath.numDopplerBins);

range = (0:Params.dataPath.numRangeBins-1) * Params.dataPath.rangeResolutionMeters;
doppler = (-Params.dataPath.numDopplerBins/2:Params.dataPath.numDopplerBins/2)*Params.dataPath.dopplerResolutionMps;

figure(1)
cLim = [0, Inf];
imagesc(range, doppler, rangeDoppler, cLim);
set(gca,'YDir','normal')
ylabel('Doppler [m/s]');
xlabel('Range [m]');
colorbar;

Here is the provided getRangeDopplerHeatMap function:

function [rangeDoppler, idx] = getRangeDopplerHeatMap(bytevec, idx, numDopplerBins, numRangeBins)
    len = numDopplerBins * numRangeBins * 2;
    rangeDoppler = bytevec(idx+(1:len));
    idx = idx + len;
    rangeDoppler = rangeDoppler(1:2:end) + rangeDoppler(2:2:end)*256;
    rangeDoppler = reshape(rangeDoppler, numDopplerBins, numRangeBins);
    rangeDoppler = fftshift(rangeDoppler,1);
return

Here is what my output looks like:

Everything else seems to work fine. I've tested the demo and the range-azimuth heat map without any problems, but I can't figure out what is going wrong with the range-doppler heat map.

Thanks,

-AJ