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Known issues in Lightning

This page provides additional information about specific known issues with the Lightning Drupal distribution.

If you encounter any difficulties with the Lightning Drupal distribution, contact Acquia support for assistance.

  • Compatibility statement for Lightning, Acquia BLT, and Drush

    The following table describes the relationship between supported versions of Lightning, Acquia BLT, and Drush:

    Lightning version Drush version
    Lightning 8.x-3.2.0 and greater (based on Drupal 8.6.x) Drush 9 (including versions of Acquia BLT compatible with Drush 9)
    Lightning 8.x-3.1.7 and earlier (based on Drupal 8.5.x) Drush 8 (including versions of Acquia BLT compatible with Drush 8)

    For information about upgrading Acquia BLT from Drush 8 to Drush 9, see Upgrading from Drush 8 to Drush 9.

  • Issues when uploading files with the dropzonejs module

    When attempting to upload files with the dropzonejs module (included with Lightning) to an application with multiple web servers that are served by a single load balancer, the web server that processes the form submission may not be the web server that received the temporary file in the AJAX request.
    Workaround - Upload files by using the /media/add interface.

Additional known issues

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