I had Thunderbird to auto update to TB 38 with Lightning installed. Then the email time was wrong, the time zone is correctly set and the time is right but the column in TB is showing UTC which is one hour wrong.
I then downloaded and installed TB 45 and invitations stopped showing the Accept, Decline etc buttons (yes, I know the tricks in the configurator and the changes with true and false with some of the parameter)
Please also add that the combination above of TB and Lightning 4.7 removes invitees and therefore does not send out invitations properly.
I can add invitees in the Google calendar and it can be seen in TB+L4.7, but if I then edit the calendar invitation in TB+L4.7 the invitees are removed from the meeting and there is sent out a cancellation of the meeting to everyone that originally was in the meeting.
I have to stop using it as it creates a complete mess.
As a sync add-on I am using Provider for Google Calendar