I noticed that when using ballistic shield I often run into invisible walls. It happens both in single player and in the DZ.
For example: i run up some stairs, see enemies and engage them, pop up my shield AND if go back down those stairs I cant run on them again because there is an invisible wall blocking me. Getting rid of the shield doesnt change anything- the wall is still there. I havent noticed this problem in closed beta.
Besides that- the game is awesome. Love the changes made after closed beta.