Alerts not alerting

I have a user who's not receiving any alerts.  Usually I simply disable and then re-enable the alerts in the Preferences dialog and that takes care of this sort of thing.  Not this time.

Some time on the ND6 Forum suggested checking the hidden ($Alerts) view which can be seen by opening the database while holding Ctrl-Shift.  This was a big help in determining that Alerts were definitely not being put in that folder, but we were still no closer to resolution.

So, I deleted the ($Alerts) folder and then did a refresh design to get it back.  After this, newly created appointments did show up in the folder.  A quick edit and re-save of appointments in the future added them to the folder also.  :-) Another happy user.