Wordpress 4.5 update pages don't load

Hi All,
I had an issue with the 4.5 update of Wordpress (looks like a few people are) where no pages other than the home page would load (all 404 errors).
The fix for me was easy, go to settings then permalinks and reapply your chosen format then save, bingo all pages load again.
Just thought I would share in case others have the same issue.