Hi @sandyj86,
Sorry for the delay in getting back to you. Could we know the version of Smush you are currently using?
The latest version ie 3.8.2 of Smush is compatibility with WordPress 5.6 and it shouldn’t be causing any issue with jQuery in general.
Could you please enable debug mode and Smush plugin so that it would give a better idea regarding the issue?
To enable debug mode, open the wp-config.php file located in your root directory, and look for define(‘WP_DEBUG’, false);. Change it to:
define('WP_DEBUG', true);
In order to enable the error logging to a file on the server you need to add:
define( 'WP_DEBUG_LOG', true );
define( 'WP_DEBUG_DISPLAY', false );
@ini_set( 'display_errors', 0 );
define( 'SCRIPT_DEBUG', true );
After making the above changes, please enable the plugin. If the issue occurs, the related errors will be saved to a debug.log log file inside the /wp-content/ directory.
Please attach these logs in your next reply via Pastebin, Google Drive or any such Cloud services, so that we could give a closer look. You can find more details about debugging here.
Please let us know how that goes, have a nice day.
Kind Regards,
Nithin