Update to 3.7.35 completely made the pages on my Wordpress site inoperable. I only get 404 errors. I was able to revert back to 3.7.34 and that fixed it. However, I recently tried the update to 3.7.37 and got the 404 errors again on pages. This time, however, I wasn’t able to make it work by reinstalling 3.7.34. Pages still give the 404 error. Same for any non post post-types. Need help, please
What happens if you go to wp-admin->Settings->Permalinks and click Save once the page loads?
Brilliant! That did it. Thank you.
Glad to help! 
Ben