Frost wall

After act 3 I've noticed mobs just walking through frost wall. Its getting pretty annoying.

Same for me, I think it started happening after the 0-pixel dodge for characters fix

Me too. At first I thought it had something to do with spell echo removing the first wall when creating another, but no, some enemies walk right through even if it's set well in advance.
And it's always the fast melee ones that sneak through, the exact kind I want to wall off the most.

Noticed the same. Also, some enemies are just instantly breaking it while walking through it, and I'm talking about white enemies. Some even just instantly break the wall when it is placed on them.