So right after masterclass it got bugged?
Well not right after, while questing soon after I noticed my number 1 slot was blank instead of having a skill.
Then I pressed 'K' to see the skill suddenly has 0 points in it but it didn't give my SP back. I had 1 spare point before, I lost the 2 points used in the skill and still have 1 point.
This sucks, do everything right and bug means you need a green reset book to fix it.
No chance I will get one of those.