This problem seems to be viewer independent. On https://jira.secondlife.com/browse/WEB-4600, Dakota Linden said a few days ago, "The Dev Team is working to discover the underlying cause affecting the Merchant Outbox and when they have information or an update to the issue it will be posted to the Jira Ticket."
She also added, on another reply, "The Dev Team does not have access to cases in the Support Portal and receives information from, and communicates with, residents through the Second Life Jira Ticket."