Ever since I upgraded to Thunderbird 31.2.0 and Lightning 3.3.1, the 'save and close' button in the event window quit working. If I click on it for either a new event or editing an existing event, nothing happens. I have to either click the 'x' to close the window and then click the 'save' button in the warning popup - or choose Event/Save menu option and then click the 'x' to close. I also discovered that another portion of the event composer/editor options doesn't work - I use Lightning for work, and occasionally for reserving a conference room for the event I'm creating. Well, now the lookup for 'resources' is gone! No way to find a conference room and reserve. Quite a nuisance! Any fix for this?!