I've got the same issue - all I see is the message sender. I have to click on the More button and select View using the Classic Reader to see the contents of the message. It gets old having to do that for every message. I can't find any way to set the Classic Reader as the default. Anybody got any ideas?

Version 38.1.0 was installed yesterday on a Windows 8.1 laptop.

Alan, I followed a previously posted instruction for a different problem, but this worked - basically you have to restart Thunderbird with all the Options disabled. To do this - go to Help, Restart with Options disabled.

If you then wish to Enable all your add-ons, once you have restarted Thunderbird (in safe mode), you can click on Add-ons. This will bring you into the Add-ons manager. Then click on Extensions - highlight each Extension you want to Enable, by first clicking on the Disable button, this will toggle to Enable, and then you are good to go.

I think the new Calendar add-on is the culprit. Hope this approach works, please post if it doesnt.

Best wishes.

So, when I started my computer yeterday Thunderbird was back to operating like it should - I didn't change anything so I don't know what happened, but it seems to have fixed itself...