Thunderbird 68.1. Links no longer work. Nothing happens when link is clicked.

Thunderbird 68.1:  Nothing happens when a link is clicked.

Tried Sandboxie 5.30 and 5.31.4

Older versions of Thunderbird work OK.

Of course Thunderbird 68.1 works fine without Sandboxie.

Using Windows 7 pro.

Fails the same on two different computers.