Just a heads up, this might still be an issue and in fact a very weird one. I got a new bug right after trying to edit SkillsData.txt again, except this time it was a different one.
I extracted a fresh SkillsData.xlsm and .txt and altered enemy heal and cure wounds. This time I made sure I did not accidentally change anything else.
I did the same changes that I mentioned in the first post about healing to both skills.
While playing I reached the Orc Ship encounter (Level 2 before entering Cyseal) and the Orc Shaman never did any spells, he either walked around and saved AP or melee attacked enemies near him. He didn't even use Staff of Magus like he always did.
I tried testing it again. I created a new game (didn't disable/re-enable the mod I left it on as is), but this time the Shaman behaved normally. I did a new game again and it didn't cause any problems.
Before trying to mess with SkillsData again, I had started a new game and made it to cyseal at least 20 times (around 5 with the new patch). However right after altering SkillsData.txt this bug occurred. I was trying to once again add skill changes to the Source Difficulty mod. although like I said in over 20 new games this only occurred the one time I altered SkillsData and no one using the mod has ever reported any of the problems once I removed skillsdata.txt.
Also I forgot to mention on the first post. Back then I tried disabling the mod, Deleting all the mod assets and putting them back, and then enabling the mod did not fix the problem.
So it is likely that just having SkillsData.txt in your mod can cause problems. This is just speculation, but it may even be likely that adding in a custom skill may also cause this problem. For now it might be possible that every time a player starts a new game or loads a save they risk the chance of breaking their game if they modded skilldata.txt.
Again it could all just be a fluke, I guess for now this is just a little warning, the only way to know if my assumptons are actually correct is if anyone else reports similar or weird issues only after they started messing with skills.
