Um... don't want to spoil the fun, but there is a low quality issue, unsure if related to the map or changes you've made.
Setup: v17, linux, DowntownMed4, Config:1
With Lightning quality set to low this map will have blacked out floor and some other textures like bins etc., see attached screenshot. Nothing except changing Lightning quality to medium or high seems to change that.
I don't know what is the policy about necroing from this graveyard, so feel free to unleash the admin powers upon this heresy, or... well, the blessed fix would put it to back to sleep too.