If I turn OFF the ‘Normal Map’ checkbox, then the Normal Map influence seems to work with whatever the image is, but if I import a real normal map and check that box, I get no bumping!
Either it’s a bug or I’m doing something wrong. I’ve tested it in several different recent builds from Graphicall.
Find attached .blend file. It’s been stripped down and packed so I hope it works for you.
brokenNormMap.blend (795 KB)