How to Fix Broken Website Layouts, Shifted Formatting & CSS Errors After an Update or Website showing Maintenance Mode ("Under maintenance error")

Overview

When updating your website—such as upgrading WordPress core, updating plugins, changing themes, or altering CSS/styling—you may notice that your page formatting shifted, your broken website layout looks misaligned, or your CSS is not loading properly or your site gets stuck in maintenance mode showing messages like "Briefly unavailable for scheduled maintenance. Check back in a minute.".

When your site design is broken after an update or trapped on a maintenance screen, it is most commonly caused by an interrupted update script generating a stuck .maintenance file, stale browser or server caching, CSS/JavaScript minification conflicts, or theme and plugin version incompatibilities. Follow the quick self-service troubleshooting steps below to clear WordPress cache, run a WP Super Cache reset, or inspect your Plesk logs for CSS errors to resolve the issue.

Quick-Diagnostic Checklist

Self-Service Troubleshooting Steps

Step 1: Remove the Stuck Maintenance File (Fix Maintenance Mode)

When WordPress runs an update, it creates a temporary file named .maintenance in your site's root directory. If the update times out or fails mid-process, this file remains and locks your public site.

1. Log into your account and navigate to Products ➔ Hosting ➔ Control Panel to open Plesk.

2. Go to Websites & Domains ➔ Click your domain ➔ Open File Manager.

3. Open your site's root directory folder (typically /httpdocs).

4. Ensure hidden files are visible in your file list settings.

5. Locate the file named .maintenance, select it, and click Delete.

6. Reload your website in a fresh browser window to verify site availability.

Step 2: Clear Local Browser Cache & Test Incognito Mode

Browsers aggressively cache CSS style sheets to speed up loading. When your site design is broken after an update, your browser might still load the old layout file over the new page structure.

• Action: Open an Incognito or Private Browsing window in your browser (Chrome, Safari, Firefox, or Edge) and visit your site.

• Hard Refresh: Alternatively, perform a hard refresh on your main browser page by pressing Ctrl + F5 (Windows) or Cmd + Shift + R (Mac).

• Result: If the layout returns to normal, clear your browser’s cache and history.

Step 3: Clear Application & Server Caches (Clear WordPress Cache)

If you use caching plugins or server-level caching tools, you will need to clear WordPress cache files:

1. Log into your site’s administrative dashboard (e.g., WordPress Admin).

2. Locate your caching plugin menu at the top bar or side menu.

3. Click Purge All Caches or Clear Cache.

4. If using Managed WordPress eCommerce, perform a WP Super Cache reset directly via the pre-installed WP Super Cache settings page.

Step 4: Temporarily Disable CSS / JS Minification

Tools that compress assets can cause a minification layout conflict where style sheets fail to parse correctly.

1. Go to your performance or optimization plugin settings.

2. Temporarily uncheck options for Minify CSS, Combine CSS, or Defer JavaScript.

3. Save changes, purge site caches, and reload the page to see if CSS not loading errors disappear.

Step 5: Check Plesk Logs for CSS Errors

If clearing caches does not resolve the issue, a PHP or plugin execution error may be preventing stylesheet files from loading properly.

1. Log into your account and navigate to Products ➔ Hosting ➔ Control Panel to open Plesk.

2. Select Websites & Domains ➔ Click your domain ➔ Open Dashboard.

3. Click Logs to inspect your Plesk logs for CSS errors.

4. Look for recent 404 Not Found errors pointing to .css files, or PHP Fatal Errors referencing a specific plugin or theme directory.

When to Contact Live Support

If your page formatting shifted and remains broken after completing the steps above, backend technical assistance may be required.

Connect directly with a Live Agent if:

• Deleting the .maintenance file does not clear the error screen or you cannot locate the file in Plesk File Manager.

• You cannot identify which plugin or theme update caused the broken website layout.

• Your site displays a blank page or critical PHP error notice preventing access to the dashboard.

• You need assistance restoring a pre-update backup of your site.