Current questions and answers regarding the map editor.

Guys, help me out. I've been working on this map for a long time, and I accidentally placed a Craigs - Dungeon Wall (not in a Dungeon). Now I don't know how to remove this thing. If I place land or water in that spot (tiles -> water/raise), the wall isn't visible, but if there's a transition from water to land, it reappears. I've tried saving and closing the map, but it's still the same. Could this be a bug in the map editor?
And how can I add a quest to the Witch Hut to obtain a secondary skill? I choose Award in the properties, set the type to Award_SKILL -> SkillWithMastery -> ... . If I choose a primary skill (e.g., Logistics), it works, but if I choose a secondary skill (e.g., Tactics), it doesn't work, even if all the conditions are met (i.e., I have Basic Attack). If it's possible to do this with a script, please tell me how to attach a script to the "condition met" of the quest. Thank you!