None of our trigger campaigns are firing - anyone else experiencing this?

While testing an event program this evening, a member of my team noticed that the "registered for event" trigger campaign didn't react to the form submit.  It just placed the member in an "on list" program status.  In doing some further testing, I've found that none of our trigger campaigns are reacting to any engagement/activity.  Is anyone else experiencing this?  Our campaign queue is empty.