Any ideas why a sales order would be missing its Bill button when its status is Pending Billing? I'm not aware of any changes in preferences or features on our end but users are reporting that their Bill button is missing as of Friday morning. They do see the Next Bill and Bill Remaining buttons but we are not using billing schedules.

Did someone enable the Advanced Billing feature? Enabled Features page has audit trail.

That appears to be the case. It shows -System- enabled Advanced Billing last Friday afternoon along with a handful of other features that appear to center around financial functions.