Color map function produces black/white images only

Hi all – We are trying to produce color maps of lizards using the “RNL Colour Maps” –> “1 – Create RNL Colour Maps from ROIs” function. We have done this before (in 2020), using the same images, and it worked perfectly. We haven’t changed any of our settings (to my memory). Now, it’s producing color maps that are white shapes on black backgrounds. I can supply an example of an image if you like. Any suggestions? Thanks!