I was using Thunderbird v 30 beta with Lightning 3.2b1 and it worked great. Thunderbird v31 was issued, and automatically updated. Add-ons are set for "automatic update". Everything in calendar is now grayed-out, and nothing works. I searched the Lightning downloads and found that Lightning 3.2b1 is the latest version offered, and that Lightning 3.2b1 states it is for "Thunderbird 30.0 and later". Obviously, Lightning 3.2b1 doesn't work with Thunderbird v31.

Two things: 1. I recommend that Lightning updates be released prior to the release of Thunderbird beta updates so that your testers who utilize the Lightning add-on have the full capability they had prior to the Thunderbird update(s), and 2. There should a) be a notice sent with updated beta versions of Thunderbird that states whether or not they will properly interface with the currently-installed version of Lightning, and/or b) the update should not be allowed to automatically update if it detects an installed Lightning add-on with which it is incompatible and require the user to decide whether or not the user wants to proceed with the update and lose functionality.