Lightning nightly no longer showing Google CalDav calendars

There's something weird going wrong in Lightning:

- None of my 10+ Google CalDav calendars are showing anymore.
- The calendars are "switched off", and when I switch them on, they just 
immediately turn off again.
- in the Add-on's About dialog, the Build ID is blank.
- The add-on will update over and over again.
- The latest build on the FTP server is from 27.8.2014.

Is this known? Is there a bug number I can watch (instead of panicking 
here :-) )?
-- 
Regards,
Peter Lairo

Bugs I think are important:
https://bugzilla.mozilla.org/show_bug.cgi?id=467153 Google Cal Setup
https://bugzilla.mozilla.org/show_bug.cgi?id=769476 Sync Reordering
https://bugzilla.mozilla.org/show_bug.cgi?id=446444 Sync for Thunderbird
https://bugzilla.mozilla.org/show_bug.cgi?id=391057 Write to Mac AB

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