Hello all, For starters if this kind of glitch is known I apologize, please send me towards the thread where this should have been posted and I will post there. I've been having problems with one of my maps recently and I will assume the likely option is to cut down the map into segments, but on a particularly large cavern map that I made for my players recently that the lighting kept breaking after a point of making too many walls. I have not tested variables to see if size of the walls or number was the more important factor. While I was creating and testing I did notice that the lighting started to make invisible walls randomly across the floor. (For note all screenshots are taken in GM Lighting Mode so you can see the walls. I did not take photos while in the player view because same thing but in player view. Also for Map info it is a 114x114 map.) Exhibit A: You will notice that there is no wall going across that should stop the player from seeing past that point. So then I decided to follow the vectors and found that the invisible walls were connecting random walls that I had made while in free form. This lighting error seemed to occur during the reloading of the Campaign when I loaded it up tonight to continue work. So when I moved the linked walls the lighting changed as well. To make this more annoying any future walls I placed down in the lighting mode no longer function and stop light. Exhibits B: Exhibits C: My only idea is to break down this map into quadrants that I can then wall and work w/ lighting so I can keep the dynamic feel working. But if anyone knows how to overcome this issue on the map already established that would be most appreciated.