Lightning 1.9 Rated 1 out of 5 stars
After upgrading to 1.9, my calendar stopped working, including integration with Google Calendar. I'm not sure of the problem, but since I could not roll back to Lightning 1.8 (because I have TBird 17.0), I installed 1.9b2, and calendar has been restored.So, something went amiss from b2 to prod.
Reply to Developer: I was already using 0.18.
Did you upgrade the Provider for Google Calendar to version 0.18 ?