Sorry there are a couple crash bugs to report in add skills and remove skills.
The condition: I have a hide effect that adds a skill, unhide, to a unit, while removing the hide skill, that first applied the hide effect. Problem 1: When verbose mode is on, activating unhide crashes the game just after the game says that the unit regained its hide skill.
Both problem 2 and problem 3 occur even when verbose mode is off..problem 2: Pressing the hot key associated with hide crashes the game, perhaps because the hide skill is removed from the unit.
Problem 3: Pressing the hotkey for unhide also will crash the game.