The funny thing is, I can edit light probes in other levels without this issue. The level in question is actually half of a level I was working on which I split into two by exporting. When I exported it I forgot to select one of the objects in it so I just re exported and overwrote the previous version of the exported level. Because of that I'm thinking it could be that if I just wipe all the files for the level in the game and editor directories and then re-export again maybe it'll fix it? At any rate I'm off for the night so I'll try it tomorrow and report back.