Contributions not showing Thank You Screen
So I finally figured out what was causing this - but it created another small hiccup. In Wordpress' theme customizer if you set any sort of static front page that's when things start breaking. I tested a bunch of different pages, the civiCRM page that is set as the base page, a page with a contribution on it overridden content and non-overridden. All these pages had the same result - the thank you page on civi generated donate links doesn't show up. (I also tested different themes, it wasn't theme based.)

But.....if you show a lists of posts as your home page the thank you page does show up! Which works for now but is problematic as you can't publish more than one post ever. If you only have one post published it shows the whole post on the home page. Once you have more than one it shows excerpts - which for me is awkward. I like my home page to be a donation page.

I couldn't reproduce this on the demo server as we (understandably) don't have access to the Wordpress settings. I'd love some feedback if I'm the only one who has noticed this or if anyone has found a workaround.