My party won't follow me around and they don't engage in combat unless I manually switch to them, which is all very annoying. it worked before, and I'm not sure what changed. I don't really use the tactics slots and I restored all controls to default.
Check underneath the character portraits. There is a little round button which is either a stick figure or a hand, depending on the mode you've activated. I'm guessing you have the hand mode on, which prevents party members from moving.