Today I installed and activated Marketpress. Instantly the formatting for my theme was messed up (acting like certain pages are mobile or something) and all my pages are returning a 404. Even though when I go into pages the pages are there, with content and the URL's are displaying in the page editor. I just cannot open or access any of the pages on the front end.
I've deactivated Marketpress and removed it from the server but the 404's are still returning on all pages and the formatting is still off.
Is there a rewrite that occurs somewhere when Marketpress is activated?