Thunderbird black at first launch with F38

[Frederic Muller]

Hi!

Installed F38 about a week ago from scratch (wayland & GNOME). When I 
launch Thunderbird the first time at every session it starts as a black 
screen except for the title bar and then... I believe nothing happens 
but since I cannot see anything I close it. When I relaunch it 
everything works normally.

Not really a life threatening situation but I was wondering if it was 
possible to fix this. Any idea?

Thank you.

Fred