Cannot see audio waves on Audacity 2.3.3

Audacity 3 Help Forum GNU/Linux
1

Today when I Imported MP3 audio to Audacity, I was not able to select parts of it or see it. I am using
Screenshot from 2020-05-15 14-58-58.png
Screenshot from 2020-05-15 15-23-36.png

2

Was Audacity 2.3.3 previously working OK? If so, what has changed on your system?