Lighting after 10.x patch - unplayable

[telco 5]

After the 10.x upgrade, the main spawn grid looks like this for the people in it.  It seems to be related to lighting, and turning toward the sun makes it worse.  The other grids are fine though, so I don't think it is the server having missing/corrupted files.   Question is, why would the users in this particular grid start seeing this, and no one else?  (in other grids)

Video of bad lighting when turning toward sun

[telco 5]

I seem to have resolved this, but not sure what actually did it.    I validated/updated server files again and that updated my default config files it seems, so I set those back, but I think there was an invalid value for OceanDepthFadeExponent in the json for that region.  Not sure why I saw it now after this update, but moved it to a value a saw in other map templates and the sun/ocean looks fine now.