I am using the version of Psi present on FTB Unstable 4.0.9, Using the Forge included. I am not using Optifine.

I made a spell and put it in a the Psi Exosuit Helmet. The helmet has a light sensor. Walking into a block in the south or east direction causes the spell to trigger and Psi Energy to be used. However, when heading north or west and walking into a block, this doesn't happen.

As an afterthought, by a block, I mean a wall such as a cave face, not a single block.

It may be related on how blocks' bounding boxes are defined.