If you have troubles since the update to WordPress 4.5 please read this post before opening a new thread.
I think I have ressolved this now after searching Error 404 (sorry should have done that before!) Advice from The Dude:
“If you find you’re getting 404 Page Not Found errors after completing my modification code, you need to flush your rewrite rules.
To do this, you need to load (but not change or save) you Permalinks settings page (WP Admin -> Settings -> Permalinks).
I did this and it worked like magic, thank you : )
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