38.57 KB, image/png
Created attachment 800670 [details] Screenshot of Activity Manager, showing a 'null' message User Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/28.0.1500.71 Chrome/28.0.1500.71 Safari/537.36 Steps to reproduce: 1) Close Thunderbird. 2) Delete the file "global-messages-db.sqlite" from your profile, to force rebuilding index. 3) Start Thunderbird and open Activity Manager. Actual results: The Activity Manager displays 'null' among the activities (see screenshot). Expected results: The Activity Manager should display a more meaningful message, such as "Indexing" or "Currently executing activities".
I have also seen this so I can confirm it. But I have a feeling this is already file somewhere.