Am I the only one still having normal mapping issues in 4.4?

Each lowpoly triangle is “highlighted” in your normal map, that’s why you see weirdness, just look at previous screenshot and compare to this rebake with different parameters


Your unwrap is designed with the idea that you have multiple smoothing groups and they are assigned to different sides of cube. One side = one UV shell and one smoothing group. If you will use single smoothing group with unwrap like this… you will get weirdness. You should either re-unwrap model to have less seams and rebake with single smoothing group or re-assign multiple smoothing groups, according to your UV shells.