Whilst playing Skyrim SE, does anyone else have problems completing Siege on the Dragon Cult, The Golden Claw & Bleak Falls Barrow (those 3 so far)?

Specifically, the game world 'grays out'/disappears & progressing further throws you back to the start. I've contacted Bethesda several times regarding this issue but, they have been unable to help & say that it's probably down to a bug.

The guys who know stuff about things like this will want a DXDIAG file, which you'll need to post in-between spoiler tags as it's huge - find the spoiler tag setup in the third icon dropdown from the left in the first bar above the post screen - and have you verified your files on Steam?