These aren't really bugs, but should be addressed.
Out of combat the pathing is fine. In combat your character are idiots. They charge into fire, poison, etc without a second thought. In combat pathing needs to have some sort of warning when you'll cross a surface that will damage you. It get really hard to tell what a surface is sometimes with all the stuff on the ground. I'd suggest turning the little dots a different color when they cross various surfaces. Alternately you could add a UI option to highlight surfaces in combat so you can see the edges clearly.
Second is the LOS. My characters routinely fire arrows and spells into wall in what looks to be a clean LOS. Some spells have the LOS drawn out, but not all projectiles do. When you high light an enemy and the attack would hit something the cursor needs to change. LOS would be trivial for my characters to figure out, but I find myself fighting it often.