Why am I getting this error when testing my game The current thread cannot require using asset ID (lacking capability LoadUnownedAsset).
When I join the game this error pops up in my output and I get a Grey UI which disappears after a fe seconds, keep in note theirs no UI in the game I am play testing which means this can’t be done by UI.
As Tavikron said, it’s most likely the sky that you are seeing while the game loads slowly. Simplest way to confirm is to change the sky that you have in the game currently to something that is significantly different, and see if the grey changes to something else.