Hello, Rion!
Sorry to see this is happening, I can understand the frustration! You’ve taken a great first step in switching to one of the default themes to confirm the theme conflict.
I notice you’re using a theme with a child theme, another thing I might suggest would be to switch to the parent theme to see if the conflict is in the theme itself or somewhere within the code in the child theme.
After you’ve determined whether it’s the child or the parent theme causing the problem the next step would be to turn wp_debug on and see if that yields any information.
// Enable WP_DEBUG mode
define( 'WP_DEBUG', true );
// Enable Debug logging to the /wp-content/debug.log file
define( 'WP_DEBUG_LOG', true );
// Disable display of errors and warnings
define( 'WP_DEBUG_DISPLAY', false );
@ini_set( 'display_errors', 0 );
Add the code above to your ‘wp-config.php’ file and then switch back to the theme that’s causing the problem. With this version of the debug code, there should be a new file created in your ‘wp-content’ directory that will give you some information about what’s going on.
Hopefully, this will get you on the path to resolving the issue. Let me know what you find out!
Cheers.
Trisha