Sorry I took so long to reply, but I don’t know then.
When I was mucking around I had a distinct directional-light I was mucking with for settings, outside of UDS. When I went into the Sun component and made my changes in the BP, they stuck.
Try and see if you can get what you want outside the package to confirm it’s UDS. And to be clear, there wouldn’t be anything UDS is ‘doing’ to break lighting or whatnot, the app uses the same components the engine does, just packaged up for us. Thus, it’s very likely a setting we need to adjust.
EDIT: this chap seems to be having a similar issue, check my response to see if it applies here?