CiviCRM 5.7, Drupal 7
As of about May 2019, around the time we upgraded to 5.7, the "guest checkout" option disappeared, i.e. it meant that donors had to create a paypal account to make a donation.
Paypal seems to believe that no changes were made on their side, and the account setting to allow guest checkout seems to be correct. Paypal's support only offered a donation url that did allow a guest checkout, and it looks different from the one that CiviCRM sends donors to.
Anyone with similar experience, or a solution?