Reminders not visible in My Reminders

Since upgrading to RT 4.2.6 users can no longer see their reminders in the
My Reminders section of the At a Glance page. The reminder is visible on the
original ticket and has an owner and a due date. Any suggestions on how to
debug this issue further?

Since upgrading to RT 4.2.6 users can no longer see their reminders in the
My Reminders section of the At a Glance page. The reminder is visible on the
original ticket and has an owner and a due date. Any suggestions on how to
debug this issue further?

Do you use custom statuses in that Queue /Custom Lifecycle?

You should go to a ticket page, get the id of a reminder that is on a
ticket and look at:
That reminder record in the Tickets table.
Links records pointing to/from that reminder ticket.

-kevin