The WordPress customizer is a core function built-into WordPress so as long as your server supports WordPress then the Customizer should work 100%. That said, there are some known plugins that could break things as well as specific server settings that could cause issues. Below is a list of the troubleshooting steps to go through to figure out why your Customizer isn’t working correctly.

 

Before doing anything else :

1. Make sure that you have updated WordPress to its latest version
2. Update your active theme and active plugins to their latest versions

 

There could be a few reasons why your Appearance -> Customize does not work.

• It could be due to plugin conflict, or plugin outputting conflicting script in your preview.
• It could be your server not having enough memory to run all the software installed. Which includes WordPress, Customizr Pro Theme and your large collection of plugins.
• Or maybe your computer does not have enough processing power to run it.
• You are having a different WordPress Address (URL) and Site Address (URL)
• And more…

 

1: WordPress Address (URL) and Site Address (URL)

1. Login to your WordPress dashboard
2. Go to Settings -> General
3. Your WordPress Address (URL) and Site Address (URL) has to be identical.
   The preview will not load if you are having a different URL

 

2: Increase Server Memory Limit To PHP

Oftentimes the customizer doesn’t save because your memory limit is set too low on your server. This is common on shared hosting plans or other affordable hosting plans.

Increase Memory Limit

 

3: Test another browser and/or close tabs

We’ve noticed the WordPress Customizer can get a bit buggy in the Chrome browser (especially when you have multiple tabs open). From our test, we found that the Customizer performs much better in the latest version of Firefox. Results may vary depending on your computer, but it’s worth testing out if you haven’t tried in this browser. Also if you have multiple tabs open in your browser (especially if you are watching some sort of videos such as Youtube or Netflix) it can slow things down when opening and closing tabs/panels.
 

4: Clear your Cache

A lot of times people have problems with WordPress because they recently updated a plugin, theme or WordPress itself and didn’t clear their cache. So please make sure to clear it just to be certain that isn’t the problem.

See here how to Clear Cache

 

5: Make Sure Your Host Supports WordPress (check that your PHP version is up to date)

If a core function isn’t working it’s possible your web host doesn’t fully support WordPress, please make sure it does. Specifically, the theme uses anonymous functions that were introduced in PHP 5.3 and if your server has an outdated version of PHP that doesn’t support these functions then the Customizer may not load or will display an error like this “Parse error: syntax error, unexpected T_FUNCTION in…”.

WordPress requirements

 

6: Make sure there aren’t any Debug Errors

Noor has been coded with WP_Debug enabled to make sure there aren’t any single PHP errors. Please make sure WP_Debug is enabled on the server and if you see any errors they can be very useful in troubleshooting this problem as well as locating issues with plugins or the server.

7: Disable 3rd Party Plugins

Note: If you are an advanced user please skip this step for now and do the other ones as they are much quicker and can help troubleshoot the issue faster. If you are new to WordPress, hosting…etc, this is the best place to start.

Sometimes 3rd party plugins that aren’t coded properly could break the Customizer. Disable any 3rd party plugin 1 by 1 to test. Make sure to clear your cache when disabling plugins 1 by 1 to make sure the Customizer isn’t still loading old code

 

8: Check Server Error Logs

Checking server error logs are the easiest way to see what may be going on. If the Customizer isn’t saving it will generally save an error in your server error logs. If you have access to them you should look and see if there is any error when you try saving the Customizer. If you aren’t sure how to interpret the data you can always ask your web-host for some assistance.

 

9: Check Child theme name (too many redirects error)

If you are using a child theme and you are getting an error when trying to load the customizer that says there have been too many redirects this could be an issue related to your child theme name. Make sure your child theme does not have ANY empty spaces and is written in English without any added characters.

 

10: Contact Support

If you can’t figure out what is wrong please send temp WordPress and FTP access to us via the Support Desk on our site with a message telling us what is wrong and we’ll be able to take a look at the problem.

PixelDima Support