I am using Thunderbird 60.6.1 (32bit). I have been using the Add-on Lightning Calendar and it has developed amnesia. It cannot find all of searched items and my Calendar Properties box is missing some selections. I figured it is because I am using the Add-on as oppose to the bundled version of Lightning. My question is where would I see the bundled version on the Menu Bar? I did try to remove the Add-on four times and it reappeared each time I restarted Thunderbird. My Lightning version is 6.2.6.1. All other aspects and functions of my Calendar are great, but the "Find Event" function. It does not search the entire Calendar for searched events. I have to different Calendars in Lightning. Thanks for any help or insight that is provided.