Did you redefine max()? Set a breakpoint at that line and when it stops, type this in the command window:
which -all max
whos max
Or try splitting up your code into smaller chunks and examine each one:
maxValue = max(corrImageR(:))
mapOfMaxima = corrImageR == maxValue;
[rowsOfMax, columnsOfMax] = find(mapOfMaxima);
It looks like when you use [maxIdxR, maxIdyR], you might be making the common mistake of thinking (x,y) = (row, column). It is not. They're not the same. find() returns rows, y, first, and the second argument is columns, x. You seem to be reversing that. So you'd want [maxIdxR, maxIdyR], not [maxIdyR, maxIdxR]
