When I first spent the points for attack after parry the skill worked fine, yet after about 30min I was killed and when I had respawned I noticed that all the melee skills I had put attack after parry on were all greyed out and I could not use the skills at all. I found out after some tinkering that it was in fact attack after parry that was causing the skills to be unusuable. I tried everything I could think of, changing the lvls of all the skills I had on there, even dragging the attack after parry skill from the melee tree, equipping/unequipping everything I could. Nothing has worked for me at all

I have tried equipping every armor type, and every weapon type, I have also upgraded attack after parry and all my other skills past what it was. I have the "difficulty bonus" on all my melee skills with that enabled so I know it's not an issue of having not enough credits, also I have toggled the parry/dodge mode button also.
Am I missing something important/obvious or is this really a bug?