Just an update on the Marvel's Avengers issue which I thought might have been caused by using driver v460.15 originally just in case anyone else comes across this "bug". Turns out that the infinite Campaign loading screen issue is caused by what I can only assume is a corrupted save file although the game does not crash and can be exited normally by pressing Alt-F4 to bring up the Quit Game prompt. If this happens that the workaround/fix is to go into the Avengers Initiative mode (this is meant to be accessed once you complete the campaign) but since I was literally on the last mission anyway it did not spoil anything for me. This mode loads fine for me and once loaded then all you do is access the war table and press up on the d-pad which allows you to switch between the Avengers Initiative and Campaign modes. This completely fixed the issue for me as the campaign loaded and once I returned to the main menu then I could again resume the campaign normally from the Campaign option.