It's unlikely I'll be able to implement a fix for this as relight uses about 6-9 sets of cubemaps vs about 15-30 sets of vanilla cubemaps all at different intervals. So when proshot tries to select a cube map at for example 2pm there is nothing in Relights lookup table to load.
Well, if proshot was able to reference relights mod files and look up the right cubemap times then it would work. You'd have to ask the author of proshot if their interested in making a relight compatible version