I compiled my map and it made my whole singleplayer games fullbright

[Yabayabayaba]

did some googling, this is likely your problem. Although I have not seen this issue before, it seems you put "light" within the color setting of a light entity. I have no idea why you might do this, but if this is correct it can be fixed by inputting valid numbers. this consists of 4 #s, first 3 being rgb color values, 4th being brightness. To find values use the color selection wheel, and then add a brightness. 200 is default, but i prefer 400 on normal lights, 1000 on high spot lights.

 

[Seitan]

I've never seen an error message attached to a BuildVisLeafs crash like this, so I don't know if it's any different...but I would try some lightmap optimization to give vrad an easier time. I read that complex visleafs can cause problems with vrad as well.

Also, what is -staticproplighting doing in your launch options? That goes in vrad's parameters (expert compile, insert before -game).

Looks like this worked, thank you very much