[horde] Loading Calendars....... Not loading

[HiP-HiPpO]

I'm running version 5.2.2 .  When I select the Calendar link from the main
menu bar, I get the calendar page with the current month, but there are no
calendar items.  When I select different views from the Calendar submenu,
I only get white pages.  The small month calendar at the top left is
displayed but the text under this calendar says "Loading calendars..."
 and never completes.  I can place a calendar on the  Horde page after
login.  This calendar does display calendar items.