Hello, the most recent update did something weird; I haven't updated for a long time though. Anyway, ever since i applied this update the default "Skill" command set got disabled in battle. It's still there; but it's not selectable...
If Skills, make sure the actor knows the skills and that they aren't sealed.
If Skill:ID, make sure the actor knows the skills and that they aren't sealed.
If both of those criteria are met, please provide the notetags you are using and the screenshot of the actor/class where they placed and where the skill and skill type are given and I will investigate further. :)


