Lightning CalDAV synch calendar stuck in version 4.7

Was working ok before, stopped working after upgrade to Lightning 4.7 / Thunderbird 45.0
My network calendar is synchronized through CalDAV to Zoho Calendar services

2 issues:

  • can’t accept an invitation coming from outside
  • cannot create a new Event

The calendar behaves like if it was in Read Only, but it’s not in Read Only.
No error shown
Synchronisation of the calendar events still works, i.e. if creating an Event on the server - it synchronizes and shows into the Lightning calendar

Anyone has the same issue after upgrading to 4.7 ?


One more note:
I am able to modify an event create on the network (from Zoho), it does reflect well on both sides. And I can delete an event that was on the server.

The issue seems to be only with:

  • Create new event --> Network calendar (CalDAV to Zoho)
  • Accepting an invitation from outside

from the error console:

Timestamp: 28/04/2016 15:42:59
Error: CalDAV: Unexpected status adding item to Marc - wuita: 409
BEGIN:VCALENDAR
PRODID:-//Mozilla.org/NONSGML Mozilla Calendar V1.1//EN
VERSION:2.0
BEGIN:VTIMEZONE
TZID:Europe/London
BEGIN:DAYLIGHT
TZOFFSETFROM:+0000
TZOFFSETTO:+0100
TZNAME:BST
DTSTART:19700329T010000
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=3
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0100
TZOFFSETTO:+0000
TZNAME:GMT
DTSTART:19701025T020000
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
CREATED:20160428T144224Z
LAST-MODIFIED:20160428T144257Z
DTSTAMP:20160428T144257Z
UID:1e6a0178-04a2-4ad4-829a-453ad978cdf3
SUMMARY:test2
DTSTART;TZID=Europe/London:20160509T160000
DTEND;TZID=Europe/London:20160509T170000
TRANSP:OPAQUE
CLASS:PRIVATE
BEGIN:VALARM
ACTION:DISPLAY
TRIGGER;VALUE=DURATION:-PT15M
DESCRIPTION:Default Mozilla Description
END:VALARM
END:VEVENT
END:VCALENDAR

Source File: file:///C:/Users/Marc/AppData/Roaming/Thunderbird/Profiles/ph2m2fth.default/extensions/%7Be2fda1a4-762b-4020-b5ad-a41df1933103%7D/components/calDavCalendar.js
Line: 699

Solved by Zoho Calendar support
See details in https://bugzilla.mozilla.org/show_bug.cgi?id=1268118