Frost Wall Visual bug and Placement inconsistencies

I'm using Frost Wall - Spell Cascade - Icicle.

More often than not the frost walls will look like they haven't been broken (after exploding them). This makes it hard to determine when enemies or myself can walk through.

It's also very hard to cast Frost Wall on narrow paths (e.g. Mire pathways and narrow hallways). When casting just in front of these places very often no Walls get placed on/in said locations, making them almost impossible to block off.
Sometimes one or two Walls will be placed, often with a lot of space in between them.