Update broke theme

I recently updated to the latest version of Minamaze (from 1.0.5 to the current version). I had taken a break from working on the site to attend to other things. In the meantime, it seems my WP installation was automatically updated, which seemed to cause strange things to happen in my site.

The site now redirects to a random page for the home page (it should display a slider), and every page shows the “Oops” message. But strangely, when I go to the admin theme customization page, it looks PERFECT in the preview.

I admit, before editing, I did edit some of the source files, but nothing drastic (mostly just small things like getting rid of the recent posts on the front page). Now after the update, I’m doing everything with a child theme, but even after having removed all my changes with the update, it still doesn’t work at all.

Any ideas?