When you’re experiencing issues with your WordPress site after installing a new plugin, it’s possible that there’s a compatibility issue between the plugin and your theme. Here’s how you can troubleshoot and potentially resolve the problem:

1. Disable the Plugin: Start by deactivating the plugin you suspect is causing the issue. If the problem goes away, it’s very likely the plugin is conflicting with your theme or another plugin.

2. Enable Debugging: Turn on WordPress debugging to see if there are any error messages that provide more insight. You can do this by adding the following lines to your `wp-config.php` file just above the line that reads `/* That’s all, stop editing! Happy blogging. */`:

define('WP_DEBUG', true);

define('WP_DEBUG_LOG', true);

define('WP_DEBUG_DISPLAY', false);

Check the `wp-content/debug.log` file for error messages related to your issue.

3. Check for Updates: Ensure that both your theme and all plugins are updated to the latest versions, as updates often fix compatibility issues.

4. Swap Themes Temporarily: Temporarily switch to a default WordPress theme, like Twenty Twenty-One. If the issue resolves itself, it confirms a problem between your active theme and the plugin.

5. Check for JavaScript Errors: Use your browser’s developer tools (usually by pressing F12) to check the console for any JavaScript errors

Choosing the best caching plugin for your WordPress site depends on your specific needs and hosting environment. Here’s a quick rundown of the options you mentioned:

1. WP Rocket – It’s user-friendly, has excellent support, and offers various performance optimization features out-of-the-box. It’s a great option if you’re okay with investing in a premium plugin.

2. W3 Total Cache – Highly customizable with various caching methods. It’s powerful but has a steeper learning curve, making it more suited for advanced users comfortable with configuring settings.

3. WP Super Cache – Developed by Automattic, the makers of WordPress, it’s reliable and easy to set up for beginners. It offers good performance improvements without complex configurations.

4. LiteSpeed Cache – Fantastic if your site is hosted on a LiteSpeed server, offering a range of optimization settings along with caching, ideal for those using LiteSpeed environments.

5. Cache Enabler – A simple yet effective caching plugin, particularly lightweight and straightforward to use, ideal if you prefer a no-frills approach.

If you have a compatible LiteSpeed server, LiteSpeed Cache could be optimal due to its server-level integration and additional optimization features. Otherwise, WP Rocket is often recommended for its ease of use and robust feature set. Always ensure you test different plugins to see which one works best with your site configuration.