Shadow Lights (Again)

[TimmayIsHawt]

Yeah so I've been having this problem with the cast shadow. So, someone told me to add a gobo to it, which I did, and it worked. But whenever I do a small change on that map, save the map, and then test the map, the light doesn't show. It shows when I don't make changes to the map. Can someone help me so I can make it stay without having to disappear and reappear every time i edit my map.