User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:25.0) Gecko/20100101 Firefox/25.0 (Beta/Release) Build ID: 20131028112627 Steps to reproduce: I noticed that my CalDAV-Sync Yahoo calendars would not switch on (there was no yellow triangle this time around though). I removed the calendars and tried to add them again, but Thunderbird 24.1.0 asks for login/password repeatedly and does not save the credentials in its password manager. The calendar URLs are of the form: https://caldav.calendar.yahoo.com/dav/your_username/Calendar/your_calendar_name Actual results: Thunderbird says that my calendar has been created, but the (Zimbra) credentials do not stick and the calendar is switched off. It keeps asking for login/password, whether I check 'Save in password manager' or not -- and when I do, the credentials are not saved. Expected results: The calendar should be in sync, and the credentials should be saved in Thunderbird's password manager if so desired.
After another change of password, CalDAV sync seems to work again in Lightning. This seems to be a Yahoo problem.