User is not receiving notifications when assigned to tickets. I have checked all of the common causes that I know of, including: Verified their "My Changes" preference was set to Notify Me Verified they could receive e-mail from Jira(via Adminstration->System->Outgoing Mail->Send Test Email)
I used the Notification Helper to see why they were not receiving notifications. Notification helper says that they are receiving notifications.
What could be wrong?