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Known issues in Acquia Lightning

The Known issues page provides more information about specific known issues with the Acquia Lightning Drupal distribution.

If you encounter any difficulties with the Acquia Lightning Drupal distribution, contact Acquia Support for help.

Compatibility statement for Acquia Lightning, Acquia BLT, and Drush

For information about the relationship between supported versions of Drupal, Acquia BLT, and Drush, see the Acquia BLT documentation.

Uploading files with the dropzonejs module fails

When attempting to upload files with the dropzonejs module (packaged with Acquia Lightning) to an application with several web servers served by a single load balancer, the web server processing the form submission may not be the web server receiving the temporary file in the AJAX request.

Workaround: Upload files by using the /media/add interface.

Acquia Lightning installation file fails due to a 404 error

When attempting to download the most recent Acquia Lightning installation file, your browser may display a 404 Not Found error message.

Workaround: Use Composer to install Acquia Lightning as noted in the 3.2.6 version release notes.

Updating profiles or modules doesn’t update configuration

Configuration files may not update when Drupal core, profiles, or contributed modules are updated, resulting in the following error message:

Configuration in the database does not match configuration on disk.

For more information about this issue, see issue #2915036 on

Workaround: See Missing Configuration During Update Process in the Acquia Support Knowledge Base.

Other known issues

For general issues known about the Acquia Lightning Drupal distribution, see the Acquia Lightning issue queue on