Skyrim Anniversary Edition came out a week ago, and with it Skyrim Special Edition updated to version 1.6. While Bethesda worked with the Skyrim Script Extender's developers to prevent the update from being too disruptive of the RPG's more ambitious mods, the update has caused a black-screen bug on loading saves, which is even affecting players who don't use mods. (Apparently, completing the Civil War questline consistently sets it off.)..
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Bethesda is working on a patch for the Skyrim Anniversary Edition update
Source: PC Gamer (opens in a new tab)