Upgrade to 2.3.3…all non-admin pages are blank

I tried upgrading from 2.3.2 to 2.3.3, and now all the non-admin pages are blank. The admin pages (dashboard, theme selector, plugin manager, etc) are all fine. The config seem fine, and I can see all the posts and comments via the dashboard. I thought the trouble might be in the theme, so I selected default and it didn’t fix it; I even tried deleting everything and only uploading the default theme from 2.3.3. The theme manager correctly detects which themes are present and selects default… but the pages are still blank. Tried fiddling with the file permissions (666, 755) and nothing. Tried renaming cache.php, reloading, and renaming back… nothing.

I’m running out of things to try.

the url is https://joshuamacy.com/wordpress/