Game wont progress during coronation and is now unplayable

Platform:PC

Do you have any mods? No

Please explain the issue is in as much detail as possible:
After beating Armag’s Tomb and returning to the capital and entering the throne room , i have the dialogue with Lindsi, then am sat on the throne.
I cant move and the UI does not appear.
there is no way to progress the game.
I have reloaded previous saves and no matter what i do, this happens when i return to the throne room.
currently i cannot finish the game, please help.

Verify the integrity of the game files

Try to update your graphic card driver

integrity came back fine and drivers are up to date, no difference, i still cant move off of the throne

I’m still not able to play the game, any other suggestions before i apply for a refund? Shame since i was enjoying it.